NEW YORK (Reuters) - Ugly Americans are everywhere, and in greater numbers than before -- so say Americans themselves. A survey released on Wednesday by Public Agenda, a non-profit organization dedicated to unbiased public opinion research, said three out of five people believed rude and selfish behavior had increased on highways and in stores in recent years. "Lack of manners for Americans is not whether you confuse the salad fork for the dinner fork," said Deborah Wadsworth, president of Public Agenda. "It's about the daily assault of selfish, inconsiderate behavior that gets under their skin on the highways, in...