I'm not a Calvinist but I must say I've seen that arrogant, rebellious, stubborn, mocking attitude with Calvinists. Not saying those of a different school-of-thought can't be like that too, but it's my personal experience being around Calvinists one I'm quite wary of now.
Why do people assume if you're not Calvinist you're Arminian? I'm neither and tend to stay away from such debates.
Those who talk much, hear little, learn nothing.