I grew up in Phoenix so this just seems normal to me.
I think the main problem is people driving behind large semis, class As or travel trailers expect them all to be slow and they can’t see in front of them. This causes them to make stupid moves just to get in front. They can’t stand the fact that some big fat slow thing is in front of them.
Now you tow with a HEMI of powerful diesel and while accelerating from a light people expect to outrun you and they end up cutting you off because they barely make it, not expecting you to be there.