And you can't force gay on anyone, being gay is not an option

Well if they knew that you thought like that maybe they wouln't have comented that, we all say stuff we regret sometimes

Well you don't know, maybe they did :/

Or it could be just "everyone could be happyer"

Gay can also mean happy, I know not everyone is happy but the "be gayer/everyone could be gayer" part is probably just a reference to a vine