FYI: I have always believed in OSAS and have defended it staunchly and repeatedly against very...stiff opposition. I did this, though, not as a Calvinist, but as someone whose soteriological views are a mix of Provisionism and Molinism. I also greatly oppose the notion of "easy believism," or cheap grace, as it is sometimes also called. Again, though, I do as a non-Calvinist.
It's not a good idea to paint with too broad a brush. This is what the racist does, right? He says stuff like, "All black folk are the same; all white folk are the same; all Asian folk are the same." In the same way, casting all Calvinists (or their opponents) in the same mold, tends toward caricatures, distortions of what is actually the case and employs the faulty, over-generalizing thinking of the racist.