Tried the search but its garbage...

This happens all the time, I'll be like "dude, today i saw this" and he will just start talking to someone else in the room or telling me a completely different story in mid sentence.. Sometimes I will say something like "Alright lets use our manners and let me finish my story" and I will just power through what hes saying until he stops talking. And that works but i sorta feel immature when I do that.

Other times I will just go silent and let him talk while i walk away or just listen completely blowing up in my head but trying to handle myself on the outside. What the f am i supposed to do in this situation without losing major value??