Infantilisation sucks. I hate it so much.
I am not a child. No matter how much I may act like one, think like one, or have needs like one, I am not and never again will be a child. I have more life experiences than a child does and that is important.
Sometimes I may need to be treated similarly (pt: similarly) to a child but I never want to be treated like I AM a child.
I do not want you to talk to me in such a babying voice but I appreciate that you are trying to be considerate of me even if you're going about it wrong.
I do not want to be treated like I'm some "innocent little baby" because I am not. I can make and understand sexual jokes (sometimes because i have trouble processing jokes and sarcasm). I can engage in and enjoy sexual content. I can also take part in sexual activities/interactions (though I won't because I'm ace).
The only people I'm OK with treating me similarly to a child are my parents because they're not actually treating me like a child, they're treating me like the autistic teen that I am who happens to have needs similar to a child's.
The difference between being infantilised and how my parents treat me is that; my parents acknowledge my autism, they acknowledge (most of) my needs, they acknowledge my age, they acknowledge my life experiences, and they acknowledge that how I need to be treated changes; people who infantilise me don't acknowledge any of that and treat and think of me as though I am a child as if I'm "less-than".
Also, the fact that being treated like a child is like being treated as "less than" is horrible. Children are people too and deserve to be treated as such.
Children are humans, they are people. Disabled people are also humans, we are people, but we are also not children (except for the ones that are actually children). Disabled people should not be treated as children unless they are ok with it or want to be treated that way. (Disabled people that need to be treated as or similar to a child are completely valid of course)