Yeah except the more you argue it, with such a black and white take on it, the more you strengthen the joke, ironically. Not its basic line, but whats around it.
Sure, it doesn't educate you, you already know it all. But you (and others like you) talking about it rubs off passively, and will circulate and that will be happening right across discussions. Here we are, talking about something that wouldn't have talked about. Pretty much 'that's how you never forget'. Bet there were people who were there on the night laughing at it (for whatever reason btw) revisiting it.
Chicago blue was also seemingly right, it fucking holds a mirror to society. At the start of this thread, it was just a bit of a shit unfunny joke that was tasteless and unnecessary. Now it is full on racist horribly offensive and unforgivable, and should lead to wholsecale changes to how comedy is regulated. Is that not a total abstraction of how we as a society will push our entrenched views to ultimate extremes?