My coworker jokingly took my phone to find my reddit id and I'm annoyed about it

This was actually months and months ago. He left work to finish school but came back recently and he still jokingly mentions my username to me, I was hoping by now he would forget about it. I want to block him but he never followed me. I haven't posted nudes or anything, and I don't post much at all, but some of what I have up is kind of personal and I just don't need him to know about it. I want to interact more on reddit more but now it feels weird. Bummer I have to make a new account 🙄 he's otherwise a great dude but I hate people taking my fxcking phone or trying to look over my shoulder. Dickwads.