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As a parodist myself, I think that's a little harsh. If you go to enough sessions, you'll hear parodies, like it or not. You don't know when they are going to be sung, and it would be a bit "precious" to get up and walk out, even if it were practicable to do so.

I think there is a case for being a bit sensitive about what you parody, and how. For example, would you write a parody of Willie McBride (I think it's proper title is Greenfields of France" or something) or The Band Played Waltzing Matilda? Some songs mean so much to so many people it would be a pity to spoil that for an easy laugh. The words of parodies have a way of sticking in the mind, even when you are listening to the original, months or years later.

Other songs are more "communal property" (e.g. The Wild Rover) and are fair game.