Honestly, this feels like a meme. I have been eating man ass for years and I am yet to find someone with an unwashed butthole. Considering how often I see this claim, one would think it would be a more common problem.
Not saying it can’t happen but, Do you have any first hand experience to support the “So many men don’t” part?
Counterpoint, you’re a dick. People like what they like, and if someone is not impressed by your “muse” or whatever, no reason to jump at their throat. It is not like they insulted it or called it hot steaming garbage, they just politely stated it wasn’t their cup of tea.