Why do People hate Yamcha?

Who said anybody hated him? I don't.

I don't think people hate Yamcha as such, but mais what he became in DBZ. In the original Dragonball, he was badass and was one of the strongest characters in the series, but in DBZ he was made into a minor character who was extremely weak and who's only real purpose was to provide filler moments and occasional comic relief. Btw Yamchas also one of my favorito characters aswell.

He was awesome in DB, but as the series progressed, Toriyama had a lot of characters he had trouble including in the plot, therefore Yamcha and several others just sort of faded. This somehow also makes him easier to make fun of.

cuz he is a player and that ful has no respect for girlz

He's a jerk, he's dumb, he has a bad haircut, he never lets things go, he takes Vegeta's insults too seriously, and...he's a total moron. But, if it weren't for him and his cheating ways, Trunks would never have been born. Though, we could go without Bulla.