Dude kicked off a flight because he was too smelly. And you know what? If you reek so bad that more than just the people next to you notice, that’s not at all unreasonable. You’re all in a flying tube with recycled air for hours. Other people shouldn’t have to marinate in your feculence.
I’ve been on a couple of flights in my time that could have benefited from this policy, I’ll tell you that.