I think it’s important for parents to try to advise/guide their kid(s) to recognize that the image people post of themselves online is not always what they’re like 100% of the time in person.
that being said, 1 of D24’s BFFs attends the college that D26 will be attending. D24’s BFF, during freshman year, took 1 of the standard introductory freshman classes…like a writing composition class or something along those lines. The professor had everybody go around the room to do a quick intro of themselves & as an ice breaker, you had to say what 1 of your hobbies are.
It was D24’s BFF’s turn to speak and she said that her favorite hobbies were reading and doing crochet. The girl sitting next to her scoffed at that and said, “OMG, like, are those even REAL hobbies?”
What was that girl’s hobby? Tanning. 
Needless to say, the 2 students did not become friends. But that’s ok because there were plenty of other fish in the sea.