That was the last time I drank close to school. It made me feel weird to see the students outside. I couldn't imagine seeing my teachers doing the same when I was younger.
I think it depends on a lot of variables.
A teacher who is friends with the family of a student drinking at a social gathering where the student is present shouldn’t be strictly forbidden. It wouldn’t be a good idea for the teacher to get hammered, but that is true of all the adults there.