If you're always having to argue with someone every time you bring a point up, maybe that RP is not for you. Differences of opinions happen, but I don't think it's a good idea to stick around if it's going to happen all the time. That drama gets old for everyone. If a GM is that inflexible about how you should play a character, usually where I feel like I'm playing to a very specific script, then I roll. If I am the GM and a player is giving me an argument every time I try to turn something down, then I have them roll (politely.)