Why are my former classmates ignoring me now?

So I went to a get together and we used to go to a Special Education day school. So we used to hang out a couple of times. I was a good student a star student but I’ve had my moments when I got snarky and gave teachers a hard time but I was always good. I was referred as the “goody two shoes” because I was always sweet, did what the teachers told me and I was always good. There was a reunion that my friends and former classmate get together, catch up and talk about the memories. I didn’t want to but my best friend pushed me and convinced me to go.
So at the reunion last night, I said what’s up? Long time no see, they just looked at me and continued to talk. Then when I tried again, they gave me an annoying look and walked away. This one classmate sarcastically said, “Oh NOW you wanna talk to me!” I got confused and said what was she talking about and she said, “You never reached out to me, you never called, or even made an effort to! If you actually missed me, you would have called! I guess since you’re in college and hang with the cronies, you’re too good to call me or the others and forget where you came from! You’re not all that. You’ve might of graduated community college and attend university, you have a big head!” I told her I didn’t have her number. Then she said that’s a stupid excuse and she gave me her number but I never called and I pushed her away before I graduated.
I never did and I told her I don’t have her number but she didn’t respond and walked away. My former classmates wouldn’t even look at me when I spoke. I don’t understand why they decided to ignore me and not speak to me. I overheard one saying she couldn’t stand me and was relieved when I graduated from the school some agreed but one said I wasn’t that bad. Most of us are 23-26 years old now.

Updates
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I mean to say when this girl said since I started to hang out with the neurotypical crowd, I am too good to contact my former peers (neurodivergent,). I’m neurodivergent.
My best friend said this guy that had a crush on me was there and kept trying to ask me out and if I had a boyfriend or if I'm dating. I told him we’re only friends and we’re talked about it.
Why are my former classmates ignoring me now?
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