Thing that just occurred to me:
Peter, from the beginning, had no problem at all when it came to dealing with Rocket.
Rocket tries to kidnap and sell him? Pffft, yeah, that’s in the past, now they are working together to break out again.
Rocket yells and threatens and curses at him the whole time? Peter doesn’t bat an eyelash and just shoots back in much the same manner, or calms the other down with a few pointed words.
Because Rocket is extremely similar to Yondu.
Peter could easily deal with and see through Rocket’s behavior because he had dealt 26 years with Yondu.
He’s used to it.