Ah, junkballers, stallers, pushers, moonballers, sometimes with a twist: funky outfits, bad line calls, bad attitudes or just weird in one way or another.
Win or lose, these characters are no fun to play. I guess it is more PC to tell them they suck only when you win, eh? Oh, I didn't mention the ten minute bathroom breakers.
Sounds like some of the posts here, following the glorious OP, are the 'all about winning' crowd. That's why a good group of tennis buddies is better than USTA for some: you can limit most of your time invested into sportsmen, not 'characters'.
In any case, OP, sounds like you and your opponent exchanged some opinions. Is yours really more 'valid' because you snagged this rare win???