Given the ubiquity of tattoos these days, it does seem to be a remarkably odd thing to give much of a toss about on other people.
The days of tats automatically signifying some sort of life event, membership or rebellion (prison, military service, Hell’s Angels, anarchist punks, etc etc) are long gone. Old Jimmy Satan might well be sporting ink from when he first killed and ate someone, but you’re just as likely to see our Chardonnay with a picture of Gary Barlow on her midriff.
In the normalising stakes, tattoos are almost on a par with earrings these days. We don’t get many forum threads going “oh my god, I saw a girl the other day who had actually had holes surgically punched in her ears so that she could wear some crappy jewellery, what’s that all about?!”