Complain about an "issue" a con you aren't at is having. Works especially well if you phrase if as if it's immoral to enjoy the con because of the "issue"
some ways i've seen work:
assume that we're all in IT or some field related to IT (someone probably already said that)
assume that most of us are secretly rich ("we're not rich we're just irrisponsible with money"-idk some friend that reminded me of this)
assume we're all autistic