And, yes, high-school aged kids are going to flirt, and act "cute" (in quotes because I don't find it cute at all), and willingly infantilize themselves (and enjoy doing it), and play dumb, and a whole lot of other things we as parents (especially we Aspie parents, since chances are we didn't do this crap and don't understand it) know aren't good ideas.
Why are they going to do things we know aren't good ideas?? Well-- How do we know they aren't good ideas?? Most times, it's because our parents told us (or our friends' and relatives' parents told them) that it was dumb...
...and we/they up and did it anyway, and we either ate the fruit or sat back enjoying, for once, the relative protection of our late-bloomerness while they had to eat it.
It didn't kill us, it didn't kill them, and it probably won't kill our kids either.
That said, I'm thankful my 13-year-old is still looking like a late bloomer (and I am absolutely going to burn the uber-padded bra that my cousin bought her, because my cousin was sexually active at 13 and I'd like my daughter to be a little closer to 31).
I'm not a prude. As long as they're not directly harming someone, people can do what they do.
But I am an overprotective mother.
_________________
"Alas, our dried voices when we whisper together are quiet and meaningless, as wind in dry grass, or rats' feet over broken glass in our dry cellar." --TS Eliot, "The Hollow Men"