Online merchants who don't deliver your product or deliver something crummy, then fight over an exchange or money back. Welcome to Aliexpress and AmiAmi, Amazon's not looking too hot lately either.
Yahoo in general. The comment section for the news articles are infested with homophobics, racists and religious nutcases. The answers community is a joke, nobody tries to do research.
Neopets. It used to be a chill, simple environment with charming designs. Its so corporate now that all the fun is gone. The shopping mall that is left of it looks so flashy with such extreme filtering that it could be run by Dolores Umbridge.