Life is all about different flavors and variety. Just because you didn't like one flavor doesn't mean you won't like the next flavor. Just because one parlor had some shitty ice cream doesn't mean the next parlor will have the same shitty ice cream or the same flavors. Trial and error. You keep trying out flavors until you find one you like, you don't like any of the flavors, then go on to the next ice cream parlor.