It is all about culture in an area. Maybe in your area people who have tattoos are treated differently without knowing them is a thing done. But it is not in other countries.
I live in an place where I feel the same as your question. But I've seen a country that doesn't care of it at all. I've seen a place where they see tattoo as an art. I've seen a country that tattoo is a traditional thing that should be embedded on their body.
It is all about the culture of a place so if you see that people who have tattoos are treated differently, go to another place that treats people with tattoos as classy.