Why are people so tired of hearing about my late mother abandoning me?

Some said they’ve been patient with me but they lost it when they scolded at me for bringing it up. My dad got tired of hearing about it and didn’t let me dwell on it and swallow in my self pity. He would get in my face and scold at me to stop talking about it and he refuses to let me bring it up and fall down. Damn dad you didn’t had to be so tough with me.
Even my siblings were tired of hearing about it and my best friends. People walk away from me when I bring it up.
She left me when I was 7 because she didn’t wanna deal with a special needs child and wanted a “normal” child. It left my dad heartbroken and would hostile sometimes when I being it up. I got told to “walk away” when I bring it up. My sister said, “Sometimes we have to be a little mean or raise our voice for you to get the point. Sometimes it’s the only way to get a point across don’t listen to us. It’s frustrating.”

My now ex best friends said before that it’s impossible to have positive fun conversations with me because all I would talk about is my bitch of a mother that wanted nothing to do with me. I yelled at them but they shot back and said, “Well it’s TRUE!!!” I yelled again but they didn’t respond.

I feel like people are more harder, brutally blunt and STERN with me because I’m autistic.