we are aware that body language is 90 percent of our understanding of someones intentions of how we understand what they are saying.

with that said ok:

my gf has been stressing about me meeting her future work mates kinda for a while now. i been telling her it will be fine i wont say anything out of line they are the extreme liberals type as she tells me. she got me new shoes to wear for it, its a big deal to her. so i play along get dressed up and look good for a first impression.

here is where things get messy we she drank a bottle of whine before we went out i had a beer i like to be more sober then she is till we get home. we get where we going and she orders drinks for me and her wow was mine strong so we switched. we all know where this is sort of going she starts to get drunk messing up her words but keeping together well its her and her friends birthday party thing so i don't mind it was expected. so i meet everyone it goes well i kept a good convo with everyone saying nothing to offend anyone doing well. two other dudes there we talk about dumb tv shows it was what they felt easy convo this goes on like this for a hour or so

dude #1 is gf is one of the girls bro# 2 is his brother and has gf that was not there bro#2 starts trying to get some of us drunk with dumb drinking game, me and my gf friend were like whys he being a tool. act cool and not call him out because my gf he starts buying her drinks and asks what she wants she says 2 of something one for me and one for her ,lol take a hint buddy so this happens like this for a half hour.

now everyone drunk even me but still holding back be hind by 3 beers. bro#2 starts to poke fun and start qualifying me to him and pesters me about my watch he says" tell me why your iwatch is so great i might want get one" i say why wouldn't you want one and give him the look sure your not retarded? so he tells me "if you could sell me on one in 3 words what would you say" changed my life. piss off bro he keeps trying talk to my gf in inappropriate ways and gestures. what ever i say

we move to the next room i am siting backwards from the bar. my gf goes up to get us drinks bro# gets up and follows her he found some one of one convo brake i knew what he was doing i cant see anything or want to make it aware that i feel uncomfortable about it ten mins go by i am watching dude #1 watch them i can telll somethings not going right he kept looking at them and i as i looked at him he looked away.

that was it i got up walked up the bar right between them nothing looked wrong i got between them and started talking to her and then he said something idk nothing really i didn't even look at him just shoved him 3 bar stools down and he walked off lol idk i never done shit that before but don't fuck with me.

shit i just fucked up with meeting her friends well maybe not her friends acted like they knew he dose shit like that but i don't know if i am right or wrong. shes not happy about it but at the same time she understands why it happened. its more her friends impressions of she is concerned about.

idk

they all left after that he walked off and didnt say bye, but other then that this it went well

As always in these situations, my advice is to let your girl handle it. You don't need to shove someone, and dont risk a fight for a girl who is allowing something. A girl knows a million and 1 ways to dodge an annoying guy...so let her dodge it. If a situation gets too immature or annoying for you, dont be afraid to say "hey nice meeting you guys, we got an early morning tomorrow" or some bs and just leave. Your girl should understand and support that.

I think my left eye is bleeding from reading this.
It's fucking incomprehensible. Fucks sake. Put some damn effort in writing your posts OP if you expect us to take the time and read it.

Anyway, what neo said. If your girl is allowing it, she's the problem, not the guy.

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This is totally unreadable! If you spend considerable time writing a long post, then put some more effort to make it easy to read with distinct sentences.

I understand that your girl is feeling pressure to make good impression for future colleagues. Some advice for you and your girlfriend. It is important to have a good or neutral relationship with people in your work environment, however if some of those people are dicks then you do not have to hang out with them socially. If they are going out of line then limit the interactions with them and keep it only at work.

Coming back to you. The deepest problem I see is that she was stressing for long time about you meeting them. I might be judging to conclusion and may be wrong but tell me if some of the following are happening:
a) Puts too much attention to what others think (her problem)
b) Sees you socially inept at times and is not confident in your ability to interact socially with people of different background.
c) Has a "higher class" job than you and is worried how you will come across because probably you are used to be getting dressed differently etc. Thus why she bought for you the new shoes.
d) She is usually judgmental of you.
e) and / or knows in advance the people are dicks and you might get offended and make a scene.

If she stayed with the guy for 10 minutes while waiting for drinks, I don't see why you might have reacted that way. If they already got the drinks and they were flirting behind your back, then that is not acceptable however we can not understand from your post that this happened. Letting this happen would be your girlfriend's fault and she does not respect you.

Personally if it was me and I did not like the people and their behavior, I would not be staying for too long. Would definitely comment about it right after we left and let her know that her new colleagues are douchebags.