I just disarm them and confuse them by saying love you thank you so much, have a great day and smile and wave. It sometimes just pisses them off because they want a reaction and you aren't giving them that reaction but they usually just buzz off at that point.

My favorite one was while I was biking on my touring bike with panniers and wearing total non-cycling clothing (including a bigger coat) beyond a helmet like not even close to looking like a roadie and some kids (I assume but I call just about everyone kids these days) yelled "get outta here you roadie" and I found it funny as I was going to buy Twizzlers, melatonin and some other stuff for some upcoming non-bike travel and I also mountain bike and wasn't even on my road bike (my touring bike was pretty upright). I was so stunned that I just laughed after being bewildered for a bit.

Though truth be told I can usually barely understand people yelling at me from their cars typically I am playing music (not on bike paths or around other cyclists) and most of the time if I can understand them it is "great music" or something to that effect. I once happened to be playing a somewhat obscure Scottish band someone liked and they also happened to be coming to town so I gave him the quick details for that and it was a great encounter. I find disarming them is better these days then getting riled up but sometimes my bad side comes through and I say stupid things but I am way better than in previous years.