On my campus we often have religious zealots that come to spew hate on the plaza as well as other religious sects that stop you while you're on your way to class to try and recruit you. When people are spewing hate I never know whether or not it would be better to confront them. I don't want to turn a blind eye to their ignorance because words have power and I want people from minority groups that are often on the recieving end of this hate, to feel welcomed on campus; but at the same time I don't want to acknowledge them because it just feeds into their rant and continues the perpetuation of hate.
The groups that try to recruit students into their churches always start off with the same question "Can I get your opinion on something?" and follow that question with one about what you believe in as far as religion goes. I always tell them that I don't have the time anymore because I'm tired of being verbally berated and because I'm afraid that having this debate at all conflates their view--in that by debating them they start to feel as if their beliefs are on the same level as facts.