Probably depends which part of Europe you're from. If it's near a package holiday resort, yes you probably will hate the English. That said I have a sneaky feeling that our time has passed what with the huge numbers of East Europeans and Russians now partaking of the package tour.
Thing with Americans is that I have to admit all those I've met and talked to for more than 30 seconds have been pretty nice people (although most I've met have either been in a work environment or outside the states, remember the majority of Americans don't even have passports). I think the problem is the bullish image the country cultivates in the media, not currently being helped by Obama blatently bashing BP for the oil spill (not saying they aren't culpable, just feels like Obama is using the incident and the fact the company is British rather than American to score cheap votes pretty much liek they did over the Toyata cock up).