I'm familiar with Regretsy. It's just art criticism, not significantly different in scope from the New York Times Book Review -- although the NYTBR tries to find good books to recommend, whereas Regretsy seeks out hilariously bad "arts & crafts" to pan.
I think the most memorable was the floral-design anal covers for dogs ("disco ball" version also available). It was never clear to me whether they tied on to the tail and simply hung down over the embarassing dog anus, or were a plug-in sort of thing. I'm not really sure I do want to know, though. No, let me reorder that: I'm really sure I do not want to know.
I couldn't find the Regretsy review, but here's a link to an Etsy auction of the same or a similar item (I believe much more recent than the Regretsy review):
http://www.etsy.com/listing/63198269/holiday-butt-covers-for-your-cat-and-dog?ref=tre-4ce057b2550b6d91277c51ae-3But I digress.
Anyway, Regretsy gets threatened with legal action frequently, and they're still going. Yes, you could probably pay an attorney to sue them. No, I don't believe your suit would succeed. (Yes, you could instead sue them yourself, pro se. No, I don't believe you would succeed.) There's this little thing called "the First Amendment", which protects not merely the rights of bad artists to express themselves through artistic works but also the rights of others to express their feelings about the artistic works of bad artists. Utilize the Google(R) search engine to search for the quoted phrase if you need more information.
Personally, I feel that Regretsy performs a public service by humiliating at least a small number of bad artists who are deserving of humiliation. By driving bad artists through the streets, hurtling putrid eggs and rotten tomatoes at them (if only virtually), and perhaps even shaming them into improving (or throwing themselves off a cliff), Regretsy helps to improve the overall artistic milieu. The founder and author(s) of Regretsy are deserving of awards, accolades, money -- nay, the Presidential Medal of Freedom. (Hey, if Obama is deserving of the Nobel Peace Prize, why not?)
Now, if we could only do something about mimes, perhaps involving a scorpion pit.