So watchu talking about?
To be honest, those people probably just saw you as an American, and if they were interested in knowing about the States it's probably to see if the idea they have about it is really the truth. Remember, us Europeans have been getting a steady diet of Bush/Palin/Romney, read crazy stories about anti-abortion extremists, Creationists, NRA and shyt, so some may want to know how fukkups like those are even possible. If you're colored, they're more likely to ask YOU about it, because those things are (rightly or not) generally associated with white americans. It's like it's actually "safer" to ask you than a white american.
To answer, first of all it's stupid to compare a continent to a country, but I the impression that some people really believe Europe is a country
So obviously you have VERY different realities, due to some countries being closer to Africa/the Arab world, some countries having a colonial history, some countries having better economies than others. I think you will encounter some "light" racism in looking for a job/appartment, in certain bars or whatever, but the guys who are full-out racist (not many) are out there in the open. But to be honest, I've been in Europe (France, Belgium, Italy, travelled to Spain, Poland, Estonia, Croatia, Netherlands, UK) for 16 years and only have like four-five clear racists events, and that shyt wasn't even threatening, just annoying.
I think a BIG difference between Europe and the US is that even through slavery, the Black Man has been part of the scenery for centuries in the US. GRanted, through slavery and discrimination, but Black people were always there. On the contrary, there were like NO black people in some European countries until like 30 years for some, even less for others. So even though there is racism in the US, i don't know, I get the feeling that it's different than here where the fact of being black is still very much a novelty. Not sure if my point is clear tho.