Fender is the only redeeming quality of FA. He's adorable and deserves better than that site.

How about a really good dragon.

Looks like we have a collective 4 votes for this idea: https://support.furrynetwork.com/topics/869-set-tag-blocksinterests-by-rating/

Support is run by a third party service. There might be a way to integrate it with FN's accounts system, but they probably decided to focus on getting features finished.