I would probably just laugh. There was one circumstance where a user created an account using my handle, which made me blush and become a little embarrassed because it was “DREAMINGOFDRASTICDREAMER”. I wasn’t offended, but because I didn’t know (still don’t) who created it or what their overall intentions were, I asked that it be deleted.
No one has ever gotten over-the-top with me on here, only mildly flirtatious, which is fine with me. If it creeped me out, I’d simply ask them to stop. If they continued, I’d take it to a mod. But so far, I haven’t had to deal with anything like that.