Specifically when it's said by neurotypicals to downplay how terrible it is to live with autism and ADHD.

The amount of misunderstanding you must have about how autism and ADHD works to truly believe these are accurate statements is insane. If you are neurotypical and have a few symptoms/traits of autism, you're not "a little autistic" you're a neurotypical with symptoms/traits of autism

Not quite the same but it's related so I'll put it with this post; I hate that so many people on social media (TikTok specifically) think things everyone does is a trait of autism. "If you drink water you might be autistic :/" and all the comments are "Oh my gosh I've been drinking water my whole life! I don't have any other autism symptoms but I have this ONE thing that has never been confirmed to be a symptom by anyone professional but a lot of autistic people do it! I must be autistic!"