That was a joke, not a insult.
It's one of these threads that was bound to be created one day. As you may or may not know gay/lesbian people were not nearly as tolerated in the past. Don't quote me on this one, but I believe gays/lesbians have been hung in the past. The bible also doesn't support this, therefore, it turned into an insult. It is only recently that this has changed, but people cannot get used to change. They simply don't want to as they believe it's wrong. There has been a lot of change revolving these matters in the past century. Give people time, it's just like the issue with woman rights last century. People eventually accepted it, because they realised they had no influence on them.
Give it time. Things will change, whether people like it or not.