I know someone who drinks beer all the time and she never gets sick. Never.
There's always an exception....
That's like the uncle that lots of people had, that lived to be 100 and smoked 2 packs a day. I never met a smoker that lived to be very old but I've heard about them. I've met a my share with smoking related illness though. Plenty with lung disease.....
Anyone that drinks beer all the time probably doesn't go far, can't drive, and sits around by themselves all day. If your not exposed to the bacteria and viruses then your not as likely to get infected. She probably has a genetic advantage, a strong immune system, which allows her to drink a lot in the first place. That's why people with young children in school get sick often, the kids are exposed to the germs at school and bring it home to share with family.
There's a reason why alcohol is referred to as an intoxicant.....it's toxic.
Putting an intoxicant in your body when your sick can only boost your immune system if it helps you to sleep. Rest and sleep or the lack of it, is the biggest challenge for your immune system.
A healthy immune system is critical to good health and recuperation.
Take care of this and you won't be sick long.