I also think Cuban should be able to say what he wants. I think people react to him more strongly than other outrageous owners because he gets so much more media attention (often self-generated, but still). I'd put Cuban's antics far below Paul Allen asking for money, the occasional loony blow-up by Larry Miller, etc.
However, Cuban's approach is part of what allows the League to (in my opinion) overprotect the referees.
I like Cuban because for every annoying or suspect thing he does, he does something admirable, or at least 8/10ths of something admirable. He might produce GODSPELL, but then he will also produce BUBBLE. (BUBBLE's not a great movie, but it's nice that, given the film making business, a movie like BUBBLE can be made.)