same thing for me. If I drink a lot the night before to the point of a hangover or close to one and then have a drink the next day I won't get a red face.

The weird thing is I haven't been getting a red face my whole life only in the last couple years. It started in my second year of college.

also im doing an experiment right now. Im not going to have a drink for two months and then see how that effect me.