I suppose its a question of what your rules are in the office.
Some people here might think the mods on this site are over zealous in their moderation of the site. At the end of the day its their site and they can be as strict as they choose. Same could be said for employers of small companies.
That said, there is a sexist issue here. How long can a woman have their hair, can they wear casual clothes (difficult to define) can they wear makeup or earrings etc . .
Growing a beard is not necessarily somebody who is lazy, that in itself is a lazy assumption to make. Some people look good with beards or goatees and just like to have them. It should be none of the employers business if they grow a beard or not (while in employment) once its being kept clean and presentable.
It is also descrimination to let some people grow beards and others not (if you base it on a presumption that some are lazy!).
Define facial hair!