Bad beer

Pretty much any American macro lager, including Busch, Bud, Miller, Natural, etc. Unfortunately this stuff dominates the American beer market, giving the many finer brews also called 'beer' a bad name.

Pabst Blue Ribbon and Coors are two generally recognized exceptions, each having a devoted following of discerning tasters despite their budget pricing.

Sierra Nevada is terrible excellent. Try the "Pale Ale", you won't regret it.