In most cases, the pain each inflicts on the other is purely psychological as opposed to physical, though the most public examples of such are protests. Proposition 8 passage, for example, triggered an instance of unbridled anger by the "gay community". And besides that, as overtly crazy and irrational as fundamental religionists can be, one has to accept that other people's behavior can have an adverse effect on their psyche, and being crazy and irrational doesn't make the hurt any less painful. There are plenty of gays who overtly showcase their homosexuality in specific ways to specific people for the sole purpose of getting their goat. They're treated as gay patriots, but it's crazy to think that it progresses the "gay agenda". It is, if anything, an investment in a long-term rival.
The emotional harm inflicted is cyclical. A cycle of emotional violence. And with each repeated cycle, both sides figure out new ways to make the other wrong. The way to break the cycle is to accept the others' emotional grievances, not fight it. It is difficult to address in the case of fundamentalists, as this is often a deep-seated condition with an obscure source, so it's pretty easy to overwrite their case, but nonetheless it's there. In the end the implication is, of course, to address individual emotional grievances. Again, I'm not interested in taking sides, or keeping scores. I don't see a point. That is part of what I am trying to convey here.