Why do people think us autistic people are naive, dense or very unaware of real life? Why is my family so protective?

I always get reminded of there’s still manipulation everywhere no matter how nice the environment is or if it’s Christian, some people won’t always be good or nice. Good things I do, me aunt and uncle has to remind me just because something or a place looks nice or Christian doesn’t mean the people will be like that.
My uncle said nobody is there to impress you. And you aren’t there to impress anyone.
My aunt says I need to think realistically because I’m not the best at noticing red flags or toxic people. This is why I need more guidance in these things than my neurotypical siblings. I always think everyone I meet is my friends and everyone will be nice and that’s why I always end up getting hurt. I always got told, “I told you!” Or “We told you so but you didn’t want to believe us.”

Even my siblings have to remind me of that and said I need to stop acting like a child and I’m handicapped. Nobody is going to always accommodate me and not everyone is going to be kind to you or like me. I always get my hopes up and end up hurt. My brother said most of these students are 18-21 or 22 years old so they’re not going to want to date an older woman, especially if she’s special needs. No offense.

Damn bro that’s harsh!
I’m almost 27 and they’re talking to me like I’m 13 or 16. I’m AN ADULT!
Christian people are good people.

My family became super overprotective when I dated different guys and told them don’t you dare hurt our special needs girl and I’m special. One of the guys checked out after he found out I’m autistic or special needs.

Why do people think us autistic people are naive, dense or very unaware of real life? Why is my family so protective?
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