Those will automatically not be my friends. Anyone who cares about sports (especially televised) or celebrities can go sit somewhere else. Or religion. Helps immensely with filtering as it usually is one of the first things you find out.

Talking nerd stuff is nicer and as such I only have nerds as friends and I married one, but there is no shortage of them. So far I made friends at any age (I am in my 50s).