1. You can blacklist uploaders who mainly upload stuff you don't like (in settings) 2. You now can hide tags you dislike, and watch tags you like (configure it in "my tags") 3. Galleries with some tags (like guro and scat) should give you a warning before you even see anything, if they don't you disabled it
It's not like people actually get surprised by the contents unless the thumbnail is graphic. They can see what the tags are. They just like trolling with downvotes, which they're going to do even more enthusiastically the more you ask them not to.