In The Walking Dead Season 6 finale when Negan sees Abraham he says:
I gotta shave this shit.
Later in S07E04 he mentions it again when he is watching the interview tapes of the survivors after they first arrived at Alexandria.
And when he returns again to Alexandria in episodes 7 and 8 he actually does shave.
So what is the purpose of this line and why does he keep mentioning it? Is there any kind of explanation from Jeffrey Dean Morgan about this line?