Not OP but I think it is good to balance a healthy respect for disregarding cultural norms with a perceived understanding of your outsider perspective and the given cost. I'm a big fan of Stallman and have worked people of similar dispositions. while they provide very clear insight and intermittent productivity spurts, it comes at a huge social cost that in some cases can make or break a team. In the long-term they could be right, but in the short-term it becomes an all-or-nothing crusade. I've been there myself and I've reassembled the pieces of a team after others did the same. Anti-authoritarianism is noble and justified, but it is no rational excuse for poor hygiene if you want to connect with other people and have a non-imaginary impact on the world.
I don't think Stallman cares about that nearly as much as you do. He already resolved that problem by making his work about collaboration instead of competition. That's really the whole point of free software in the first place.
Of course, that doesn't mean I'm here to encourage idiosyncrasies. My entire point is that you aren't going to win such a person over with an appeal to authority, because that was their point already.
Sure, I would argue that good hygiene is a useful tool for liberal collaboration, but that doesn't make his behavior ideologically inconsistent.