The epidemic of crack

So I'm riding the bus and it is an uneventful ride.  It was so boring that I was ready to fall asleep until this Amazon boarded.  She seemed normal other than her height until she passed me and I witnessed what I would estimate to be approximately 6 to 8 inches of booty crack.  Now I understand that in this age of low rise jeans that women don't have many options outside of "Mom jeans" but what is the socially acceptable amount of booty crack that a woman can show without being offensive or obscene?  What if you have a "high or long" booty crack?  Personally, I like women's booty crack in crack friendly circumstances.  If it were up to me ass out jeans for women would be legal (as long as your ass is hair free).