If you mean the overall gender, why BOYS hate GIRLS, then it switches, then its hormones. If you mean a BOY hates a GIRL, then it is more of a changing feelings kind of thing. It can not be explained, because there are many answers.
There are many reasons why some boys seem to hate girls. They may have been brought up in an environment where girls are not valued. In that case the hatred can last a lifetime and be passed on to male children. Some boys act like they hate girls but they are really only insecure around them because boys mature later than girls and are not as comfortable in social situations. Boys brought up in a "jock" atmosphere have little use for girls.
Boys and Girls
Its not hate but many teen boys only think about looks...
Not all boys hate fat girls. Boys want someone who is fit and can show-off to there friends. (sometimes) Some boys dont really care about girls physical appereance. IT all depends on the guy.
fat boys tend to be funny and not try as hard as fat girls
Yes but lots of girls hate on the boys. When I first joined Girlsense, the site was only for the females (girls). But a lot of users recommended to the girlsense team to start allowing males, so they girlsense team created faces for boys too.
Because straight boys are homophobic in other words they hate gays(note:not all straight boys hate gay boys), while gay girls are girls they are from the opposite sex so basically they would like girls but probably they would like straight girls better than gay girls.
Prekiss
most girls hate blowing in general.
I cant speak for all boy but I hate losing to anyone. :}
because they smell and they're ugly.
They hate girls who chew with their mouth open :))