Based on the snippet you've copy-pasta'd, it looks to me like this community is less anti-gay and more anti-porn. I mean they specifically ban m/f along with m/m and f/f. It seems like the admins are twelve-year-old girls looking for safe, PG-rated genfic, only they've never heard/don't understand the term 'genfic' and are using slash as a blanket term for all possible sexual relationship combos. I could be wrong, but that does seem to be how they're presenting themselves. I would say talk to them about it before stamping them with a label that they might not deserve.