I disagree. The community as a whole is what decides whether or not it tolerates that kind of toxic behavior, not the tools available to it. When that message appears that's when I know it's time to prepare explanations of bosses and critical mechanics, and it's a good opportunity for me to try to get some discussion going in the group. "Hey there! For whoever is new, please speak up if you'd like to know more about what to expect in this dungeon! I promise I won't bite!"

Low level or high level, it's never failed me and I feel like that message takes some of the pressure off of announcing that you're new to a place, because the game already lets people know for you. Maybe I'm wrong, but that's how I feel about it. It's really unfortunate that people out there tend to forget that they, too, were once new and someone had to help them along as well.

Edit: It's really sad that I have to say that last sentence less than a month after official launch. That's kind of messed up.