Why is it okay to rub your eyes, pick your fingernails but not your nose? I do not know, but a small group of players feels as if any of these behaviors, or other disgusting practices, is acceptable at the poker table. Do they feel as if they briefly turn invisible to the other players? No, that cannot be it.

I actually saw an otherwise well groomed, neatly dressed, well mannered person "air-blow" his nose onto the floor next to the table! That is, he closed one nostril with one hand, turned his head to the side and blew! I have seen athletes do this on the playing field, in the grass, but never inside on carpet. What allows people to act so unrefined?

The urge to satisfy their momentary needs allows them to deny the existence or significance of the other players at the table. This should tell you about their abilities to deny other things. Like the improbabilities of their hand's chance to win.