Some Americans may well vote for the rightwing candidate because they want to stick it to the left (or whoever the "anti" would be).
Personally, I don't think that alone makes a majority in that binary choice; in Europe, it would mostly end up in the vote for a minor "ultra" party. And less-"anti" conservative voters have other options.
In the US though, as someone with conservative values and views, one always has to choose ... do I want to vote with everyone else who votes for "my" camp including the stick-it-tos (because there's only one option "on my side"), do I not vote, or do I even vote against what feels closer to me because the stick-it-tos vote for them as well, and/or their head on the ticket is clearly one of the stick-it-tos ?
Am I glad I needn't make that choice. And am I sad what kind of asocial extremes are encouraged by the binary, winner-takes-all US political system.