Because you have to understand leftists. Don't assume that they're like you and me. They're a breed unto themselves.
Liberals are the biggest poseurs on the planet. They don't care about issues, they care about aesthetics. The current "racism" and "homophobia" hysteria has little to with racism and homophobia. They're just trendy and cutting-edge issues. That's why so many libtards 'support' them. It makes them look 'edgy' and 'cool' and increases their status among their peers.
Remember, high school never ends. The same dipshits that used to follow the latest clothing and sneaker trends in high school are now making fashion statements with political issues in order to appear cool. Oh, and, by the way, they 'hate' us because that, too, is a fashion statement. Don't take it too personally.
Never take these liberal faggots at face value.