I see it too. I find it really irritating how casual people are about drinking. But then that is because I always had a massive problem with it. I can't understand that other people aren't having the same problems I had and are seemingly happy drinking all the time, but then I wonder if anyone thought that about me, I was a fun drunk in some ways and never got in trouble, I bet someone somewhere wished they could drink 'normally' like me
Ultimately though, it doesn't do me any favours to worry about other people's drinking habits. It just causes that 'well I am not as bad as him but I am worse than them' type thinking which just kept me drinking really. Even after I quit, I was a lot happier if I just concentrated on my own relationship with alcohol and let other people get on with whatever it is they want to do.