Las Vegas , artificially lit rooms crammed with people obsessively feeding slot machines when it looks as if they have little cash to spare in the first place. All you can eat buffets that make you long for a plain , undressed green salad and a glass of tap water . The fastest growing city in the US but I wonder what sort of values a child growing up there will imbibe.
Munich but only during Oktoberfest. Much less fun than it sounds , very unlikely to get a seat in the beer halls without pre booking as part of a large group and a definitely threatening atmosphere as darkness falls. Also suspect some "racial profiling " going on as to who they let in the halls.
Anywhere where a cruise ship/ships have just disembarked . Crowded , noisy and rushed , visit after the crowds and enjoy.