It may be time for a discussion with him to get his views on the matter, and it is without a doubt a time to espress your views as well.
Communication is the best way to start understanding.
Listen to Corine, get all the info you can on the subject. I am not sure I should say, but, don't ask him to stop, at least not yet. This condition is inbred in us at a very early age, and stoping can do lots of mental damage. Corine can help.