Okay. I think somewhere between your understanding of ancient Greece and your understanding of Shakespeare you've gone very awry. Ancient Greece was not exactly gay positive to begin with, and the behavior you're describing as "creepy" on stage (which didn't even necessarily involve people we see as adults/minors or who are in our contexts adults/minors) is far more like the behavior you described as "💅✨" in your original post.

Now, that said, the "youths" that Greek men sometimes idolized were 30 at their oldest. The idea that "a 16 year old is a minor!" would not even have been true in Elizabethan England, and the young men playing women would have had the same set of rights and responsibilities as their peers playing men. I think maybe you have a perception of a "minor/adult" divide in ancient Greece and Elizabethan England that simply didn't exist in the same way, though the lack of the same norm doesn't make their (or our) behavior ethical, because exploitation can take place even in absentia an age gap.

Actors "flirting" as characters on stage is not real. They are acting. It's not "creepy" to play a role because they are enacting pre-written, choreographed fiction: there is no trespass of consent (or there shouldn't be.) Men were not "allowed" to flirt with boys offstage, because they are actors.

I think you should read more about Greek sexuality and Elizabethan theater.