This is the most annoying shill tactic because it relies on deliberately ignoring the fact that establishments are allowed to have their own rules.
This used to happen on /r/The_Donald a lot. Concernfagging was an instant ban because it was a deliberate blackpill to try and derail the hype around Trump.
People would pretend like it was about "oh, so you're against free speech, huh?"
No, it's because you're clearly here trying to pick a fight, hence the tone and the presumption on your part that we're disallowing you something. A "friendly" indictment of the people you claim to be complaining about.
TLDR: Glow harder, shill.