In seriousness, it's not about *guilt*, guilt is abstract, but it's typically about acknowledgement
What offends for example blacks in the US is when they percieve a lacking acknowledgement. Slavery in the US was recent, and effects will probably continue to last. Look at American city maps, and society is in all practical terms still segregated. Not to a full extent, and not in a way that is set by law, but in a practical manner - whites live here, blacks live there. You're not supposed to feel guilty about that, or feel sad, or *do* anything, you're just a Graves, or some other American, it's not "on you" to do anything, really - other than to acknowledge. Acknowledgement can be entirely passive, just saying "ah, indeed, look! there is a truth to this!"
Blame, hate, guilt etc, are... ugh... such unfortunate byproducts of that dialog. It helps nobody, and it only aggravates things. Some, like good old Mutie, seem to *demand* guilt and emotion and action and something, this leads nowhere, because there's nothing you can do.
That's the frustration of many white Americans, when faced with this demand: What the hell am I supposed to do, fly into a time-machine and stop slavery!?
What I see, though, sometimes, are arguments like "black communities only got themselves to blame".
This is sowing salt into wounds. This is not acknowledging a brutal past that IS - relatively recent. Recent enough for some people to know the actual names of their great grandmothers and whatnot, who endured this life. To have this hurt simply brushed aside as a triviality can be enough to cause very deep anger. Again - you aren't supposed to TAKE guilt upon yourself. I, a lefty, declare this! It's NOBODY's fault who's alive today, NOBODY who's alive today is to blame, and NOBODY SHOULD FEEL BAD. Y'all got lives to live, things to do.
All that is required - by reasonable minds anyway - is acknowledgement. Black communities have fallen behind because of the *chasm* of inequality between masters and slaves. A gap that continues for generations to follow is inevitable. In humor, irony as well as frustration, this acknowledgement has become synonymized with "white guilt", which really is counter productive, because it is unfair.
/rant.