Re: dirty uniform
I don't disagree that it isn't something that a man couldn't say, but depending on the person and their personality, sometimes one method is better then another. I guess an example would be if you had your zipper down at work. Sure you would want someone to tell you. Some would prefer to be told in a quiet subtle way. Others could care less if you yelled across the room "JOHN! YOUR FLY IS DOWN!"
On another note, just because someone is an adult doesn't mean that they aren't shy and sensitive. Everyone feels awkward when they first join a dojo. It was just a suggestion that could help minimize the embarrassment or the awkwardness of the situation.