As a cyclist in Scotland who's never had any trouble on the road, I was going to sympathise with your having to put up with a toxic culture in your country. But then I saw your in the UK!
(I've never had issues when cycle touring in Scotland)
I specifically remember truck drivers cheering us on in the highlands. Magic! :D
Sadly I've seen reports in the news of people in Scotland getting rough treatment there too.
Luckily, it's just a minority though. Most drivers, like everywhere, are just normal decent people.
From what I've gathered it seems car drivers are annoyed because overtaking cyclists requires more thinking than following the white line, and envious because cyclists don't have parking space problems and can just get off the bike and switch to the sidewalk.
Some people feel entitled to more rights on the road because they paid more for their vehicle.
"I was going to sympathise with you are having to put up with [stuff]" - doesn't work.
This might have been a hint that you were looking at the wrong "your".
I think this is mostly down to having more cyclists on the road.
There is still a long way to go though.