all-black club, kicked me out for drinking my beer

We're in the midst of the COVID pandemic, and half the clubs are closed. This place had about 5 dancers on the night I went. It's an all-black club. Cover $10. A strange thing happened : I bought a beer for about $10 and was given an unopened beer in a small trash bag. I sat down and opened it, and a security guy came up to me and yelled in my face that I had to take the beer outside the club to drink it. Also that I could not leave the beer opened on my table. So, I just left, feeling kicked out and having spent $30 (beer + cover + some tips) in 5 minutes. Now, maybe that's just the rules for COVID-19, but then (a) why do they even sell beer ? it's 10x more expensive than at 7-11. and (b) why does the security guy take of his mask and yell in my face ? Now that should be against COVID-19 rules. Sheesh ! Maybe wait until after the pandemic.