To discriminate simply means to chose....
I suppose with tatts, it would depend on the job....
My son wanted tattoos, and he has collected some very nice ones....
We came to an agreement, that they would be marks that would not give him problems in later life....
Y'know... 'I love Mary' doesn't go down well with a wife named Sarah....
He agreed that the tatts would be in locations that he could display or not, depending on his choice of clothing....
I would have some reservations working with a nurse with vivid tattoos openly on display...
It would say something about that persons ability to understand consquences, or understand other peoples feelings...