Personally I walk and cycle a lot in Paris, I don't drive myself but do get Ubers fairly often.
Pedestrians: what's wrong with half the people, it's almost more common to see people walking into each other than stepping around each other, constant lack of what I'd consider in England to be common courtesy when walking near other people on pavements.
Cyclists: what's wrong with half the bikers, they ignore lights, wriggle around cars, go shooting past pedestrians too fast, etc. Actually some cyclists are like that most places I think. Some of us aren't idiots, though.
Drivers: what the fuck, the fuck, is wrong with Parisian drivers. Never seen such bad average driving competency in Europe before. Only slightly less crazy than I've witnessed in China. Doesn't matter whether you drive a smart car, land rover, bus or taxi, it seems if you drive in Paris you are constantly trying to edge ahead of anyone you can, overtake if there's a tiny gap, honk your horn all the time... wow.
My personal experiences: when I'm in a taxi I find poor driving (often of my driver just as much as other vehicles) annoying as hell but only a couple of times a little scary.
As a pedestrian I don't really have issues... if I step into the road I look first, simple.
As a cyclists I'm constantly dealing with cars to my left and people on the pavement to my right, mostly people who are more than happy to take two steps backwards onto a road without looking while stood chatting to friends. And on top of that you have the really dangerous car drivers, of which I've been seriously frightened quite a few times now...
All in all, I get pissed off by idiots in each group, but it's when I'm cycling that it affects me the most by far.