When the color of one’s skin is an accident of birth, it has no meaning regarding the content of one’s character.
When the color(s) of one’s skin is artificially modified, it may have such meaning.
And you think a tattoo on a Aussie aborigine, a native African, a Arab native, an old sailor, and enlisted USN, USMC, USAF person, etc...change's the content of their character?
So...let me get this right. If you had two people that you became friends with...talked to, got to know. And both had no visible tattoo's...and you liked them both intellectually and character wise equally.
You would change your opinion of them, and shun them and call them "stupid" because you found out they had a tattoo???