Is gender a stronger bond than other areas of identity such as race, ethnicity, or class?

Answer 1

no

class/educational level
ethnicity
gender

Answer 2

I think gender is certainly very important for example in complicated situations such as the runaway trolley. Chances are that a person will chose someone based on their gender than in ethnicity or race. (Although ethnicity is a big one too)

Answer 3

I can see that in parties or gatherings where everyone is a stranger to each other. All the guys drift together. But women do not seem to do that as much.