Of course not. Is it racist to hate Tyler Perry movies?
For the record I've found that if a type of music is a target frequently and has a large Hatedom, it's a given that I hate it too (hip-hop, metal, country, pop and the garbage that 20RP12 likes).
You basically exclusively like a few incredibly specific types of post-punk music and you think everything else is garbage, right? That's not racist, you just have ridiculously idiosyncratic taste in music. You probably know why better than anyone else.
I would just say, maybe give non-post punk music a try. Maybe hip-hop isn't for you, but don't seem open-minded at all. And, if you're going to compare an entire genre to a single hack film director, you make yourself look like an idiot.