A business such as this reserves the right to deny service to anyone for any reason. I've seen these notices all my life.
I was once denied entry to a pool hall because I was wearing jeans with a rip in the left knee. (This used to be standard dress; my favorite clothes are what I call "ten-year clothes", after a green shirt I'd owned for over a decade, which I retired after wearing while receiving my daughter. What? They're the most comfortable clothes in the world!)
First off, the bar did have a right to deny me entry on the principle of anyone for any reason. Additionally, it was to my error; it was actually a posted rule that I was aware of, but had never been enforced against me through many prior occasions. To the other, though, management's response to the doorman was, "You what?!" Their other response was to revise the wording of the rule to from "No ...," to "We reserve the right ...". No, they never apologized to me, and they shouldn't have to. But everyone aside from the doorman was aghast that people who spent that much and tipped that well were denied entry. Especially on a dead night.
O.J. doesn't even have that going for him. The bar, technically, did not even need to post a rule to deny my entry. Comparatively, OJ and his lawyer need to shut the hell up.