Oh, God in heaven - preserve us from assholes of all persuasions!
Put very simply.
1. A session is not somewhere to LEARN AN INSTRUMENT. It is somewhere to learn tunes, develop technique, and generally improve all aspects of musicianship. People should not try to join in with a session unless they are basically competent on their instrument.
2. If you walk into a pub with a session going on at which you are not one of the "faces" - you MUST either ask to join in, or at least make it so obvious that somone will invite you to join. You wouldn't dream of sitting down at a table full of people having a chat, and the same applies to people making music.
3. An egg is not an instrument, it is a noisy frippery. I've been known to play them on occasion, and even the bones as well (but only with pipers), but nobody really thinks that an egg is in itself a musical instrument, do they??!! Tolerance of morons with no music in their body should not be accepted. Having said that, it is my firm belief that all bodhran players should be able to play music on another instrument, as it means they understand the vibe better, and have more sympathy with the players. Maybe that sounds a bit fascist, but I consider myself to be a good bodhran player precisely because I can also play the tunes I'm accompanying.
Here endeth - a.w.