It's easy to think of beers that I like, but, thinking about beers that I don't like, there are many..
Beers that I don't want to drink:
There's Panda beer, the sweet (yeech!) beer from China.
There are all sorts of Belgian beers that have fruit flavors in them.t
There is the horrible Shiner beer that has the "hint of red grapefruit" in it.
Beers that I wouldn't refuse to drink, but don't buy:
The wheat based beers.
The beer that comes in a bottle that looks like a Red Strip Ale bottle, but it isn't Red Stripe Ale. It's ofen on sale cheap.
Pasteurized-for-export versions of Guinness.