I'm a Class 1 HGV driver (44t Artic), 95% of my driving is in a truck, i find some people are polite some are not, have noticed when i flash a car to let them out a slip road into lane 1 i get no thanks, but a car flashes them to let them out into lane 2 the other car gets a wave
, had a few raging car drivers joining the motorway who think i'm responsable for pulling my wagon out from lane 1 into lane 2 to let them out the slip (flashing, horn, finger etc) i will pull out if it's safe and convenient but most of the time it's not, even had road ragers when i've spent 10-15 seconds in lane 2 of a dual carrageway overtaking another wagon
, used to get worked up about all that but nowadays i just chill out behind the wheel (including my car) if minor sh!t happens (like encountering rudeness) i just laugh it off (an older driver taught me that, he used to sit there laughing "ha,ha, look at the state of this guy" etc
), if stuff is happening that's out of your control it's not worth getting stressed.
Generally i think the roads have become more hostile in the last 10-20 years, dont know why ?, cost of fuel ?, longer working hours ?