Creepy has a lot to do with not picking up on signals from other people that your attention is not wanted (or in the case of genuine creeps not caring about and ignoring those signals). Unfortunately that works against the advice you just gave. I do realize this is problematic when that advice is kind of needed by someone who suffers from excessive self-consciousness.

And of course you mainly learn to pick up on those signals by practice. Which I guess points back to your advice.