Personally, I wouldn’t be shocked if the popularity of tatoos is waning; in fact, that’d be more or less what I’d expect. Consider that part of the reason it exploded in popularity was as a way of the younger generation rebelling against the older generation. These days, it’s not uncommon to see people of all ages with tatoos, so anyone motivated to rebel for that reason will no longer have that reason.
That said, it seems to me that tatoos are more or less generally accepted by society to a certain degree. Sure, if you are thoroughly inked, or have something showing poor judgment in a visible place, it’s still going to be looked down on, but I don’t often see people who have a ton of ink that aren’t some sort of artistic type or the like.
Personally speaking, I have a great deal of respect for tatoos as a real form of art, particularly interesting because it’s a collaboration between the artist and the canvas. Just like with other forms of art, if someone has flash or whatever the current fad in tatoos might be, I’ll feel the same as if someone talks to me about pop music rather than a genre or artist I have a great deal more interest in. I seriously doubt I’ll ever get any tatoo work done myself, though I’ve toyed with a few ideas. But particularly tatoos that are significant, don’t have any potentially offensive imagery, and especially if they’re either easily concealed or in an out of the way place, like the ankle, I just don’t see much reason for people to complain.
And, of course, in all of that, I just don’t get the idea that having ink should make one a protected class. I think to some extent, some tatoos allude to other classes that might have grounds for protection, like aforementioned cultural tatoos, particularly Pacific ones, or perhaps things like military tatoos. Regardless, to me, a protected class should be something that is essentially immutable and not a choice. One can’t just choose to be a different race, gender, orientation, etc. Particularly in the case of the story in the OP, it was clearly a decision, and it’s not like she can claim it’s something culturally significant. I don’t think it’s a big deal at all and it’s silly to fire someone over it, but I still think it should be within the rights of her employer to do so.