Who are you to say that? What make you "suppose" something? Who told you / where is it written? What is your qualification to judge what is good and what is not?
Please keep your immature thoughts and beliefs to yourself. If someone is happy with a tattoo you have no business to comment on it, unless you can prove it scientifically. It just takes a bit of common sense to judge what kind of comment is appropriate in certain situation. You are immature and incapable of reacting according to the situation. Your prejudice and lack of common sense will not help you in future. Think twice before you speak.