I have heard that as the argument goes that if you take the non-Calvinist position, that means that you believe that you contribute to your own salvation, somehow putting your salvation in the *salvation by works* category.
IOW, the only alternative to Calvinism is salvation by works ergo, if you are not Calvinist, then by default you believe in salvation by works.
I don’t see it that way: I’ve heard too many good Baptist preachers teach Grace alone by faith alone to buy that argument. I see it more as a theological debate, not an issue of salvation.