Honestly, there is no way for anyone with administration/mod power to act like that. If they were caught doing so, they would likely be demodded and fired. Again, as Sekani said, the PSU mods/admins will have blue name text.

Just use your best judgement in situations like these. No real authority figure would threaten banning you. They either do (with signifficant data as proof), or they don't.