From my experience, dark type humor is a very cultural thing, some countries take a much bigger offense to it than others. The U.S in particular is very polarized, when a movie or a TV show says it is "fine" but in a real life conversation is almost like a taboo.
In any case, dark humor is a difficult subject, you either hate it or love it, however, in the case of the people that enjoy it (myself included) you have to be careful and only tell it to people you trust and you know aren't going to take offense.
I think you should have told the guy to knock it off as soon as he started to tell the first offensive jokes, it has happened to me, when I get little bit of trust on someone and I tell a dark joke and I see they took offense or told me "not cool" then I stopped completely and I know from now on to be careful of what I say with that person specifically. Any person mature enough knows when to quit it.
Nintendo and PC gamer
