Would it detract from the prestige of a college if a professor taught classes like this?

I have a distant cousin who teaches at a university barefoot and wearing shorts. In what way, if any, do you think his attire will take away from the college’s prestige ? Or do you think if his boss doesn’t say anything it’s perfectly ok? This is not a junior college as if that makes any difference. Needless to say? his class isn’t very difficult.