I applaud people that want to help new people get started in this game. It has a learning curve, and new people can get quite frustrated. It benefits everyone when a new person wants to get interested in this game.
The Main Arena is a tough place for a new person to learn, but if they are willing to ask for help, they should get it. Sometimes the help comes in the form of politely asking if they have checked the Training Arena for a trainer.
Other times, there may be a trainer in the MA which should help them.
No one should be made to feel inadequate just becase they are new. Telling someone to alt-f4 is rude. If you do not have the time to help them, then just let them be. They are better off repeating a question on channel one than being told to alt-f4.