Unsupporting parents

Has anyone else had bad experience with telling their parent they are autistic. I (F24) recently told my mom I think I’m autistic and her immediate response was “you’re not” and she said it with such disgust and frustration. My mom and I often get in arguments because I will start talking and often when I talk I keep pounding a single point to make sure my point is getting across. I feel like this is huge in ADHD and Autism where we keep saying the same thing almost waiting for someone to interrupt because when they interrupt me and ask questions or make a comment I can tell that they are tracking and understand what I’m saying. Every time I start to do this she gets so mad at me and yells at me to stop talking. And the kicker is my mom is a therapist… she wasn’t always a therapist but she went back to school about 8 years ago and now she is. It’s so incredibly sad that I am 24 and just now exploring an autism diagnosis and all these things that are really obvious to me seem to have gone over her head. Like I didn’t have friends until middle school and even then they all kept dropping me. I was mute in school until first grade because I was so overwhelmed by the children around me I just blocked them out. Going back now and thinking about these things (and way more too much to type out) to me it is very obvious. It’s is really hurtful and harmful that she didn’t even ask my why I felt this way she just said I don’t have it and completely invalidated my identity. I think part of the reason is that I am high masking and attractive so I don’t fit the “stereotype” of autism. I think she also associates autism as being bad because she sounded so mad when I said it. It just really hurts to not have my own mother. A therapist. Not validate my experience or even ask about it. Now I don’t feel safe telling her I am because of how it went before. Just feeling really sad about this and looking for support if anyone else deals with this too as I’m sure we do a lot in this community.