I'm soo upset

I went shopping, and met someone I went to school with once.
We never were friends or so, but she started talking, so after she told me what job she has and such things, I told her that I might have AS and explained it to her.
After that she said: I always knew that something with you was wrong, but now I know you are a ret*d mutant.
I was speechless

I don't understand this, I mean, why did she talk to me, if she don't like me?
If I don't like someone, I don't talk to them. This reaction makes me sad

I can't stop thinking about this..