"Don't willfully endanger other guests of our establishment if you want to be welcome" is hardly an arbitrary rule. Whether it is selectively enforced is unknown to any party.

In any case, it was a rhetorical device employed to point out that there is little to no practical difference between the group featured in discussion and other groups, that said group self-identifies as being a polar opposite and tends to vocally despise.

One reason spheres are apt descriptors of idealogical spectrum is that is you travel far enough in one direction, you end up on the opposite side.

For who could be free when every other man's humour might domineer over him? - John Locke (2nd Treatise, sect 57)