Whenever I see one of these 'parodies' along these lines, I start wondering when people are going to stop thinking that recognizing and fighting against systematic oppression against non-white (and non-male and non-cis and non-hetero) people means 'apologising for slavery'. Because usually when the "GAWD! WHADDYA WANT ME TO DO, APOLOGISE FER SOMETHIN' MY GRANDFATHER DID!?" line, and its best friend "We were poor farmers! We didn't even haaaaave slaaaaaaaves!!" come out to play, it's when a point has been missed so hard that even the best of pencil sharpeners cannot recover said point. And when it becomes ~super funny~ to joke about such declarations because ha ha of course they're not necessary what are you stupid, I'm still left wondering who in the audience thinks it's just as silly to apologise - or even recognize - the racist stuff society pushes on everyone right now, and how they contributed to spreading it and reinforcing it.
To be honest, though, and this may be because I'm a biologist used to thinking in evolutionary time spans, it really hasn't been that long since slavery was the norm in the United States. 150 years sounds like a lot until you break it down - it's just two little old ladies of 75 years old dying back to back. I mean ffs, as of 2013 the US was still paying one last pension from the Civil War[footnote]http://www.usnews.com/news/newsgram/articles/2013/07/03/one-civil-war-veterans-pension-remains-on-governments-payroll[/footnote]. It's not as ancient history as people would like to believe. That apology - that somebody stepping up to freely and fully admit that his family members, not so far removed from him, did really crappy things - might have more weight than we'd like to admit.
Or on another related topic, we could talk about a real-world equivalent that's still up in the air - many people are still trying to get France to apologise for dicking Haiti over. Basically, if you look at Haitian history, it's "stuff happened, Haiti became decolonized and a free place for non-whites, every other country flipped their fucking shit and purposefully set out to ruin Haiti and it very much is still reeling from that blow. iirc there are some lovely letters from some of the founding fathers saying as such. Much like France, the US was in a position to critically help, but Thomas Jefferson among others stepped up to yell 'hell no' because recognizing a country of ex-slaves put their own slaves at risk[footnote]http://www.upress.state.ms.us/books/742[/footnote]. France, though, is considered much more culpable because Haiti was a French colony, so the damage of colonization is directly France's fault. More pressingly, France pretty much presented a bill to Haiti saying "hey, we know you were slaves and all and you were horribly oppressed but pay up". Haiti is still expected to pay[footnote]http://en.wikipedia.org/wiki/Haiti_indemnity_controversy[/footnote]. It's a major burden to their GDP, government, and economy at large. And France absolutely does not want to let it go, even after Haiti got slammed by the earthquake in 2010.
So yeah, still kinda current political news to consider things like France officially apologising for slavery and other things they did to Haiti by way of reparations. The joke's not so funny when you consider how true it is in some respects.
(Learning about Haiti's independence is cool anyway because Toussaint Louverture is a grade-A badass and interesting dude, but I digress)
