Mindless zerging speed run = 0 challange.
Teaching someone new how to be better = Hardcore because I bet most people cant even be bothered to try.
EDIT: I wanted to elaborate.
Communication is key, that is not really hard to debate. Absent that communication though, what can be done to help people understand whats going on or how can you help others succeed.
Observation. Say you tried to communicate, were met with silence, then proceeded to run as a speedrun. Then you die because Tank couldnt hold threat or DPS wasnt even there or not using AOE moves, or healer wasnt on the ball for healing. Isolate the issue then try to compensate, pull smaller groups, run as a normal run, hotbar an extra heal for emergency help. Party play is teamwork. The most experienced player in the group has a responsibility to assist their other members, condescending, rude, accusatory comments do not help.
We also need to keep in mind that there are a large portion of Console users that are a bit of an anomaly in the realm of MMO's, How many MMO's are there on consoles and how popular are they? Few and far between. Most Console users this is their first MMO, they may not be proficient with use of a controller, the menus, the subtleties of MMO "code of conduct" (You gotta at least watch a vid on a fight before doing it! Check out the forums! etc).
Gamepad play does not mean anything but most console users that are on a gamepad and may not have a keyboard. I know, personally, that I get really upset when I see someone berating another player because they are not performing to the expected level of the other player. Have a little consideration and show some humanity. there is another person on the other end of those pixels. People like the one in the thread mentioned in the OP is why I prefer to be in the party when my son plays. For the most part, people are impressed when they party with him saying that he did really well (I tell them Im training him so be patient) then at the end of the run I reveal that he did ok for a 9yo. but then you get the odd shining example of a human being who likes to berate others telling them to uninstall, they are the worst player they have ever seen, go kill yourself and other wonderful phrases i would rather not mention here.
Too often people forget their first time in a new kind of game, learning the ropes, how it felt to have that eureka moment when some part of the content finally made sense. Too often I see people who are so self absorbed they cant even contemplate putting themselves in someone elses shoes or even entertain the idea that not every player they run into is going to be as good as they are.
Honestly, I would rather play with a bad team that is losing all the time and eventually triumphs over the final boss and has fun than be in a dungeon where some asshat takes it upon themselves to demean other players for a simple mistake that didnt even kill anyone. So please, Don't be an asshat.