even in jiu jitsu... marcelo garcia is by all accounts one of the best to ever compete, and he's the nicest, most down to earth person imaginable. bernardo faria is also a champion who seems very kind and soft spoken. rodolfo was a beast but always struck me like a really cool dude.
there are plenty of really great characters in the sport.
yeah, i'm sure all the champions who don't act like cunts have crippling anxiety.
believing you're the best has nothing to do with being a douchebag. it's just something douchebags use as an excuse, and it's completely nonsensical.