Some people learn things better on the fly. Like me. I go in dungeons not knowing what to expect, and I am a tank.

Once I do know what to do however, no matter if it's the 10th time or the 100th time I run the dungeon, if I see a new guy, I will always ask him to follow my lead, and explain boss fights. It's really not that hard to be a nice person, you know? I don't get this obsession over "my time". I'm assuming OP is also not the sort of person to help people who are looking for a tank/healer in a dungeon like Toto-Rak or Brayflox because people are not worth his time to help.

Do your part to help the community grow. I'm hearing all these terror stories about new players not wanting to say they're new because they'll get ragged on. I was helping some FC mates in Praetorium yesterday, and there was one guy from DF who told me he got ragged on for not skipping cutscenes, that he actually gave in to peer pressure and skipped them. I actually felt sorry for him, and told him to take his time to watch all the cutscenes this time instead, because they are that good. People simply have no more patience in the world for other people anymore. It's as if nobody has compassion or helpfulness anymore.