If you do want to tell me I'm personally wrong then come at me with facts, reasons, and logic. I'll listen, I'll consider your points (even between foaming lips of rage), and I'll weigh them against my own evaluation of what I think is important. If I still disagree, though, then we need to agree to disagree. If you continue to press your point, though, I won't stay around.
Belittling my opinion is never okay.