Saw a clip with a hidden camera from Saudi in a drinking club, sign said Muslim men can't get served, which I assume means men in robes aren't found there. However Saudis do drink on the down low and someone there said they prefer vodka. Then they arrange scat parties.
In Saudi drinking alcohol by Muslims, non Muslims, and even tourists was a strict no-no. Later it became "highly frowned upon". But last year they opened their first liquor store in Saudi and you (non Muslims) can purchase and consume alcohol, but only within a certain area (in the Diplomatic Quarter.) You also have to register in their app and there is a quota that you are allowed.
Now in Qatar (Doha), it is a bit different. You don't need to register unless you are drinking in an non licensed area. Otherwise the licensed areas are considered hotels, taverns, clubs, as long as you not a Muslim, Islamic scholar, or religious authority.
But every time I fly Qatar Air, I see Muslims on that plane drinking like crazy because it's really the only place they can do it without worry.