I find that picking your nose can be a unconscious thing you do, but the sensation of sticking a glove into your nose quickly makes it very not unconscious very fast
But of course, hopefully the person in question will choose to change the glove.
Otherwise yes, glove wearing dogma is overdone, however still, should probably wear them.
Yeah, I wouldn't care if someone cooks with bare hands, assuming they actually wash their hands properly. I'm only unhappy when I see them taking their nasty smartphone out of their pocket and doing something with that, then continuing to cook without washing their hands (or without putting on new gloves). Gross!