Once again, how is some one being gay having an affect on me? I haven't seen it yet. Gay people have been around before I was born. I'm sure racists back in the 60's had the same argument that blacks were some how affecting society.
Maybe you are not part of society? Do you watch more and more TV shows that joke about homosexuality, that have homosexual characters? Are there products out there that target the homosexual audience? Do doctors and hospitals have to devote more time to homosexual specific treatments or issues? Was Aids a huge deal years ago when it was thought there was nothing anyone could do to help with it? There are more ways... but just because you don't have first person interaction or contact with homosexual individual doesn't mean you don't get 2nd, or third, or fourth level "contact".
As to the blacks affecting society argument, blacks do affect society just as any other person does. You decide if that's a good thing or a bad thing for yourself. Personally I think it is a good thing depending on the individual, and in general a good thing. Lame argument though.