To mock the beard can also lead to Kuffar. To shave off the beard and lengthen the moustache is the way of the Kufaar, Mushrikeen, Majoosi and Christians. It is for the reason that the Prophet (sallal laahu alaihi wasallam) commanded us to act against this by lengthening our beards and trimming our moustache. The moustache gives off a certain secretion which is not healthy, and if it were to go into food and water, then it would be unhealthy. Therefore, we should trim the moustache and not shave it off completely. To shave the beard weakens the manhood. To dye the beard and hair with black dye for man is prohibited by authentic Ahadith. Some ladies also get beards or moustache. They are allowed to remove this.