I think it would be like asking a woman to loose weight?
It is very personal...and even though I don't like hair on a man....would I even be brave enough to ask?
Then he may ask me to do something and it becomes slightly complicated.
Should they be expected for their partners, no I think not....unless it is greatly excessive, and you feel he may have better quality, when wearing clothes.
I know for some men it can be itchy, and uncomfortable in summer...or wearing certain shirts ect.
In that case one could approach it for that reason, but for our own likes...I think that is rude.