I think it's because it's a state with a lot of transplants (such as yourself) so you have a big mix of driving styles all interacting and they sometimes clash.
I'm just astounded by the complete disregard for other humans while they're in their cars. This is one of the biggest reason me and my wife are looking to resettle elsewhere in a couple of years.
this shit happens everywhere
An Oregonian will cut you off without signalling, then drive 52mph.
Florida by nature of it's popularity with tourists and retirees has a lot of the latter. Most people drive about average. When the local average is dragged down by hordes of tourists and retirees even the people who wouldn't otherwise drive that way do so because it's what's normal around them.
Weaving through traffic at 20 over the speed limit and making illegal and surprising passes is an example of something insurance doesn't like, and doing a poor/ineffective job of driving.
Actually, that's not true. Highway 360 on Maui (The road to Hana) was the most terrifying driving I've ever seen, but that is due to the state of the road, and the familiarity (and lack of interest in spending more time then they have to on it) of the locals.