No, they know Bane exists, just the Batman version of them.
Fuck, when I wear my Bane hoodie (the "classic" blue with yellow letters), I usually hear from random people "You like Batman that much? That's weird...Why would you root for Bane?". I don't even bother explaining anymore, haha.
That sucks man, hahaha. It's hard enough explaining band merch as it is, but when it shares the name of a popular Batman character you're SOL.