That's an absurd false dichotomy. We don't need to choose between being okay with banks discriminating in all circumstances and discriminating in no circumstances. If you support banks serving the Proud Biys are you okay with them serving Jihadi terrorist groups and autocratic dictators? Porn isn't trying to establish a white ethnostate.
I think you are drawing a false equivalence between the Proud Boys and jihadi terrorist groups. A better comparison would be between Proud Boys and members of Antifa.