Maybe because of who we hang out with? I tend to find myself spending a great deal of time with the under 30 crowd lately.
And the "age gap" that they are worried about is just a few years.
If your information about the man in question being only 22 is correct, and I have no reason to doubt it, this story is a prime example.
He is a "predator" because he is trying to date a (gasp!) teenager, who is a full adult but never mind that.