Easy to do on Teamspeak/Vent/Mumble. Right royal pain in the arse in group chat especially if you need a perk used at the right time or a player not to hit the boss at a particular moment.
If people don't know an instance the place to learn it is in a guild, not in a group that asks for experience. It's also, surely, incumbent on a new player taking his or her own initiative and looking online for tactics, perhaps watching youtube before joining a group that asks for exp. Basically what they're asking for is you know what you're doing and you can get 99% of the way there by your own research.
A group leader may be asking for experience for a reason, eg the he may only have a short time in the game that day and doesn't want to have to teach someone how to play each dungeon.
A little bit of common sense goes a long way and in the situation the OP describes the onus is on newbs to do their own homework.
If a new player perpetually fails and continually wipes the group then the gl is within his rights to kick the player and the newb is not within his rights to indulge in some hippy sit down protest.
The fact the newb knows that by not budging after being kicked, fecking it up for everyone else perhaps shows he's not such a newb after all and just a poor player.