I've had no problems in Asia with anti-Americanism (they generally seem to just look at foreigners v. non-foreigners rather than having strong opinions of individual nationalities).
Europe is a different story. On the continent, generally no problem. You have the same shrill far left types you have in the US but I'd say you are less likely to meet them in a social setting in Europe than in the US.
The only people I've met who are openly anti-American with any regularity are other Anglophones. The Canadians tend to be the argumentative leftist douche type while in England and Ireland a lot of people get aggressive when they're drunk - start calling you yank, making fun of the accent, generally looking to start conflict. Even in this group, it is a small minority. The only surprising thing is that you'll see behavior that in the US would be associated with lower class hicks being exhibited by educated middle class people (a surprising number of English seem astonished that other nationalities speak English with a different accent). And the English are the only ones I've met who will use anti-Americanism as a way of digging at people they dislike for other reasons (I encountered it a lot when working in England from people who were jealous about pay, career opportunities, etc).
Europe is a different story. On the continent, generally no problem. You have the same shrill far left types you have in the US but I'd say you are less likely to meet them in a social setting in Europe than in the US.
The only people I've met who are openly anti-American with any regularity are other Anglophones. The Canadians tend to be the argumentative leftist douche type while in England and Ireland a lot of people get aggressive when they're drunk - start calling you yank, making fun of the accent, generally looking to start conflict. Even in this group, it is a small minority. The only surprising thing is that you'll see behavior that in the US would be associated with lower class hicks being exhibited by educated middle class people (a surprising number of English seem astonished that other nationalities speak English with a different accent). And the English are the only ones I've met who will use anti-Americanism as a way of digging at people they dislike for other reasons (I encountered it a lot when working in England from people who were jealous about pay, career opportunities, etc).