This is a great question! My initial thought is that much of the negative attitude is "assumed." If I look around my workplace, I see that out of 30 or 40 men, I am the only one with a beard. There are maybe 2 or 3 with mustaches too. There is still a part in our dress code that says all facial hair must be neatly kept and trimmed. I guess everyone else assumes that means "shaved off." I am the first to challenge this code and have been met with much positivity!