Please do not listen to this request!
Instead try to give advice in a respectful manner - or ask beforehand if said advice is welcome. If someone doesnt know how to play their classes and refuses to listen to some (respectful presented) advice, feel free to blacklist them and pray that you'll never have to deal with them again.
Giving geniue advice has nothing to do with elitism but with offering help to someone to improve themself - if you dont care for improving yourself, please stick to premade-groups or single-player games only. Not knowing how to play and ignore advice is pretty rude and you're making yourself a burden for the rest of the playerbase.