Well, I'm not a loud, tattooed, etc bloke if that's what you're implying? but I don't think I've met a polite Thai IO yet. So, a lot of them must have bad days and i think a polite one is rare. maybe you're a good looking bloke and that's why you get politeness😆 But us ugly blokes only get IO's who on a good day might not actually snarl at you.