Try telling a sexually charged joke at your place of employment and see what happens.
World leaders freely slandering other countries like this is shameful, and not what you expect from a "world leader".
Americans love to glibly propitiate to Reagan's spirit (in heaven I'm assured), there's no way they could be doing so out of ignorance of the more controversial aspects of his presidency?
I'm not seeing it. That joke could just as easily be told for any other national leader and it would still work.
Whimsical off-topic stuff can be ok, but flamewar off-topic stuff isn't, and a greatest-hits of bad Reagan is definitely that.
This is in the site guidelines (https://news.ycombinator.com/newsguidelines.html) and there's lots of past explanation at https://hn.algolia.com/?dateRange=all&page=0&prefix=true&sor... and https://hn.algolia.com/?dateRange=all&page=0&prefix=true&que..., though you might have to scroll through boilerplate to get to the more substantial explanations.