If you have to rely on "of course this was written by a <insert a group based on their immutable characteristics>" to make an argument, perhaps the argument doe

If you have to rely on "of course this was written by a <insert a group based on their immutable characteristics>" to make an argument, perhaps the argument doesn't hold as much merit as you think it does. It is one thing to point out a group based on something like a political affiliation or their socioeconomic status (especially when they are directly relevant to the argument), but another when you go for things that are entirely out of their control, like race/gender/sexual orientation/etc. The former might be relevant, but the latter is wack.