After skimming through a lot of these posts, I really must admit that both sides have some pros and cons to their points. But I don't think that the kick (if it was started by a mentor) was justified.
Gear: I dungeon grind a lot for gear, have been for quite a while. If the OP bought tank gear, could be on accident. I've messed up and bought the wrong gear before, even for my Summoner.
What to run/average iLv.: The debate on requirments to get into instances aside, I don’t think it shouldn’t matter what you run as long as you can meet the requirements and try. I usually do daily roulettes, then a few dungeons each day so that I can get some tomes. I don’t see why it should matter where they come from, as long as the person getting them is at least attempting to do something in the dungeon.
Cross-class skills: Trust be told, as a Summoner, I didn't have Raging Strikes for some time and I still don't have Quelling Strikes. Yes, the skills do help in dungeons, so I wouldn't ignore them, but I've never gotten kicked cause I didn't have cross-class skills. I do some pretty decent damage and should invest in Quelling Strikes, but haven’t yet.
The terms “Casual”, “Elietest”, etc: Usually these are terms I stay away from. There are very few people that I call “casual” players and probably even less that I call “elitest”. To me, how much someone plays and how long they’ve been playing doesn’t matter in this conversation. They’re in there for the clear, so a mentor should be helping them learn or giving tips, tricks, and suggestions, else not trying to do the things a mentor would do.
I think Talya’s comment here reflects what I’ve heard from many mentors in my FC and what I would probably end up doing if I was a mentor:
I’m not attempting to ridicule the Mentors who are out there and who are trying to get through Lv. 60 content with what I’m saying, but as a caster DPS, I think DPS is just not something that should be a factor when clearing content with new people.