Yea, from my experiences I've noticed that people driving cars generally hate mopeds. They're just jealous of us.
Though, I love it when some asshole speeds around me only to get stuck at a light 100 yards up. That gives me the opportunity to exercise my shit giving abilities. As a standard I usually yell "LEARN HOW TO SHARE THE ROAD" followed by a tasteful derogatory noun. But I like to mold my 'shit - giving' to fit the situation. Ergo to SUVs i would yell "STOP KILLING THE ENVIRONMENT" followed by said noun. Or to a group roid rage homophobes, "STOP SUCKING EACH OTHERS DICKS AND LEARN HOW TO SHARE THE ROAD WITHOUT KILLING THE ENVIRONMENT" noun (plural)