I know a couple of people who are allergic to barley, which is present in varying amounts as barley or malt in beers. But they break out in a rash after consuming it rather than have it come straight back up.
dr subir is is correct you dont tolerate the taste or not used to it
This is not allergy to beer, which by itself is very rare. You just do not seem to tolerate the taste of beer.
i have a friend who i allergic to beer because of the hops.