I'm 16, and I've never heard of online names being used in real life... It would just be weird. If I was called "Jaytrek", (or worse, some of my other online names with numbers in them)- I'd say something like 'What did you just call me?' 
I might respond to Jay (because it sounds like the first part of my real name), but as I can't think of anyone who actually calls me that, it'd probably take a couple of tries.

I might respond to Jay (because it sounds like the first part of my real name), but as I can't think of anyone who actually calls me that, it'd probably take a couple of tries.
