Ill tell you where you went wrong, when you texted back "thats rude", when you said that to her you actually came off as rude yourself, it wasnt funny or playful, she was in class possibly or was busy at the moment. Its usually best to text first this day and age until you are on a phone calling basis. Im not about my wits at the moment but even something as simple as this would've improved your chance to get message back.
"hey just [insert what ever you are doing at the moment], havent talked to you for a while hows it going?"
then she'd respond back with whatever
then it woulda been an ok time to poke fun about being rude
"oh yea thats cool, btw do you always hang up on people so fast, that coulda been your mom you know..ya jerk

"
Even that woulda been 10 times better, but good luck man, i hope you find what works for you.