Sometimes disabled people get treated like they’re not adults.
This is particularly true when people with disabilities are involved in disability related advocacy. And it goes triple for people who have intellectual disabilities. (Or are perceived to.)
If you’re doing advocacy and someone treats it as cute, they’re being rude. If someone treats your presentation like a game you’re playing, they’re being rude. People should have more respect than that, even if they disagree with the point you are making.
If you think someone else’s advocacy is cute, it’s probably important to work on learning to respect them more.