In my nearly 20 years as an officer with the ATC, I’ve never heard anything like that said before. I’ve never read QRs, but I’m certain that there has never been any such things said in any ATC rule book.
Besides, what makes you think that any commission RAFAC staff would be welcome in a the Sgts Mess? The whole point of separate messes is so you can relax without worrying that your seniors are watching.
Your other posts come across as quite anti-officer - perhaps you are letting your personal prejudices cloud your judgement when it comes to wanting to believe so called facts?