Prison rape jokes are a part of rape culture. Making “don’t drop the soap” and “become someone’s bitch” jokes means you think rape is okay if it happens to certain people.
My understanding was always that it came from spanking. I know this is a knowyourmeme link, but this has always been my interpretation of the history of that phrase.
Regardless, not great
knowyourmeme.com/memes/butthurt
I had never heard it being a reference to spanking either. I'd always thought it was an allegory of "taking it in the ass" or "he really got buttfucked" so you could use it in "polite" circles. The way I commonly see it utilized is in response to one being perceived as over emotional to a slight.