Yeah I used to have this problem a lot. It's simply just a case of them being rather childish/nasty and think the world revolves around them. There are nice women out there you just have to dig a bit deeper, maybe delve into the LGBTQ community, some of my best friends are lesbians and asexual females and they are super easy to get along with. A lot of these like straight mainstream girls tend to just think every other girl is a threat, especially when it comes to men so it's kinda just boring if anything. It's the best thing ever when you have a female best friend who is really similar to you cause you get each other and there's no awkwardness or sillyness. Keep at it I'm sure you'll find a few.
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The term Aspergers is no longer officially used in the UK - it is now regarded as High Functioning Autism.