I think people's responses here might be coloured by where they live, tbh. I live in a city, there's a bike path on an old railway line nearby, bike tracks in the city, plenty of segregated parts as well as some annoying shared use bits. Driving in the city means having bikes and scooters around, there is no avoiding it. Most of the city is a 20mph zone.
If you live in a town where you get to A roads quickly, not many cyclists around, not many bike paths (or not useful/well maintained ones at least) - you probably are less confident driving around cyclists, see them as an aberration, see them as slowing you down in a 30 or 40mph zone or even on dual carriageways etc.
I'm not sure that drivers always realise how much cyclists have to contend with shit infrastructure and keep their wits about them to stay safe. You're constantly making a calculation about what the road layout tells you to do, whether this is actually safe to do or if it's geared towards cars or is a bad design, and how to get where you're going avoiding the hairiest roads with multi lane traffic etc. All while also watching out for pedestrians and scanning the road for lumps and bumps that could knock you off.
I don't condone jumping red lights or not giving way to pedestrians at all. I think sometimes you have to have experience of cycling to understand cyclist behaviour. It would be beneficial for everyone on the roads if more people cycled, at least occasionally. It might stop some of the belligerence from motorists.