He chooses a username that invites ad-hominem, such as you're engaging in - that is the direction you jerk your knees, not political alignment - in a forum which works to move past such biases.
If his username isn't appropriate here, it's not because it's not fundamentally clever, but because the audience hasn't been paying attention to, or learning from, their lessons.
If his username affects your judgment of what he has to say, and you realize this, then you've just learned something about yourself, and you should thank him, instead of condemning him. He's just done you a favor.
Of course, people don't actually want their own biases to be shown to them, nor to admit to them so that they can get past them. They'd rather the cause of the bias go away than have to confront it.
Granted, he could just be making a political statement, or be a troll. Thank him anyways.
ad-hominem, such as you're engaging in
I am? Quote me.
If his username isn't appropriate here
The question is not of "appropriateness". Choices you make provide information about you. The more idiosyncratic choices you make, the more information these choices provide.
A username of "Bob" doesn't provide much. A username of "XXXpretty77XXX" provides some. A username of "I_will_fuck_you_all_with_my_big_dick" provides a lot.
If his username affects your judgment of what he has to say
His username is evidence that (...
This thread is for asking any questions that might seem obvious, tangential, silly or what-have-you. Don't be shy, everyone has holes in their knowledge, though the fewer and the smaller we can make them, the better.
Please be respectful of other people's admitting ignorance and don't mock them for it, as they're doing a noble thing.
To any future monthly posters of SQ threads, please remember to add the "stupid_questions" tag.