I call bullshit. Teenagers aren't complete in their development yet. That's why you can, and should, train and teach them.

Teaching empathy is of course difficult and don't forget that the bullied peers are also teenagers that might behave "weirdly" (no victim blaming intended). But the whole thing still needs to be taught as it is a horrible thing that exists in reality.

Compare this to drugs, STD, or plain old reckless behavior. You tell your teenagers not to take pills, use condoms, and not dive headfirst into unknown waters, right? Not everyone does this successfully, but there is no reason not to talk about it, just because your teenager will Roll their eyes. If that's any criterion, most parents would probably not talk to their kids at all between 12 and 20...