I have heard both President Obama and President Bush booed. I have no doubt I'll hear the current occupant and whoever comes next booed at some point if the country can't find some common ground.
This was what happened, booing and cheering for and against both. Twice. It made the experience just really crappy and I loved the attraction previously. Those experiences just made it feel "tense" but I was also going 3-4 times a year at that point for long weekends, and I reckon I'm just about to get back to that. The point is to say, I had plenty of opportunity to see some not so pleasant behavior and, while I'm not one for WDW "magic", I do try to disconnect and kinda just want to think about the good points of American history and the world on a quick getaway.