The claim that every culture only picks a handful of animal species to be considered edible, and this is part of some sort of psychological defense mechanism, is BS too. Counter-example: China, or any society that has access to a diverse hunting ground for 'game' or 'bushmeat'.
Even a 'picky eater' society like the US that only eats a few kinds of land animal species treats all fish as edible but only a few named species as 'the good ones', and only a handful of plant species are commonplace in the diet despite lots more being readily available.
Even a 'picky eater' society like the US that only eats a few kinds of land animal species treats all fish as edible but only a few named species as 'the good ones', and only a handful of plant species are commonplace in the diet despite lots more being readily available.