Was I being an asshole for being brutally blunt to my autistic classmate?

Okay so I have known her since last year. We met in high school several years ago. I used to say hi to her but I’ve moved on and I don’t really want to talk to her. She’s autistic but she’s so sweet, smart but she can be very annoying and does things that’s so uncomfortable and blurt out things. She thought she was so special because the people around her told her than and talks to her like a child. I don’t like that. She gets angry when things don’t go her way. One time in theater class, she got kicked out because she threw a meltdown and a temper tantrum for being wrong.
She messaged me last week and wanted to catch up on me. Truth is, I don’t really want too. She’s so annoying and truth is, I was only nice to her because she has a disability and didn’t want to be seen as mean. Now we’re out of high school I don’t have to talk to her. I was like, “Hey (my name)! Remember me? How been?”

I just said, “Hey. I’m doing okay…”

She asked me what’s wrong and is she happy to hear from me. I don’t respond for four days.

She messaged me so many time and ask why aren’t i answering and friends don’t ignore each other and dont ignore special needs.

I got irritated and said, “I don’t want to talk to you! I am busy and have a life. I am TRYING to get away from you. Can’t you see that I want nothing to do with you? You’re annoying, an entities brat and I can’t hand with someone that throws temper tantrums like a two year old. I never liked you that much. You’re not special and you never will be. Nobody cares about you like you think. We are not friends. Do me a favor and stop messaging me.”
Then that’s it. She said I am so mean and I need to be nice to her because she’s autistic and special. I blocked her. Was I mean?

Was I being an asshole for being brutally blunt to my autistic classmate?
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