People will probably continue to debate whether parents or child free people are more privileged, whose rights trump whose in the use of public space, whether disliking small people who their parents admit are inherently noisy and unable to understand social rules is bigoted, and really, why would anyone think that a restaurant should be quiet anyway?
Personally, I think adult space is important, even for parents. Conversation that you can actually hear, uninterrupted, adult beverages and language, and behaviors that are not safe for children, but adults can engage in. Mixed space is important, and children's space is also important,but I certainly see why adults don't want kids to see them sipping a cocktail and discussing the politics of BDSM.
Unrelated: talented kids, but really, was all that booty shaking and cootchie popping nessacary?