What do you say to people who dismiss your concerns by saying that they’re sick of “everyone” getting diagnosed?

My own sister said this. I started telling her that i believe I could/should get diagnosed and she started ranting about how “everyone” and their kid has adhd and how they’re “not special” and she wishes they would just keep quiet about it.

I understand that it’s probably coming from a place of her own unmet needs/not feeling seen, but I’d like to have a sure-fire, logical, totally convincing comeback the next time someone else says something like this.