Re:
Why do I like road riding?
I don't need a car to get to the start, my back door is the start.
MTB can start from your back door, have some imagination.
I get to make a journey and travel, so I ride through the gritstone areas of the northern peaks, through the southern white (limestone) peaks and back to my house.
Again you can do that om an mtb both on and off road.
I don't need a change of clothes, else muddy the car seats, plus cos I don't have a muddy arse, I'm welcome in pubs and cafes
Never heard of mudguards ? Plus publicans who ban mtb riders are losing money.
I can chat or banter as I'm riding with my buddies.
So can I, not all tracks are single track.
I can look up at the scenery instead of detailed looking a couple of metres in front for that next rock or tree root
Have you seen the state of British roads ?
I don't have to clean all the mud and water off my bike transmission as much as I would do with an MTB, and it all lasts longer and continues to work slick years later
Anything you look after lasts, there are many road bike rust heaps.
I'm not having to ride up 1 in 2 gradients on a 36 back sprocket, hoping that my back wheel keeps traction and risk my nads, nor am I descending near-impossible descents, forever compensating and hoping that I don't crash
Nobody has to do that on or off road, thats a choice thing.
I don't get stuck for miles behind walking groups who feel they shouldn't give way
they have as uch right to be there as I, a little courtesy goes a long way.
The bike looks classy, not like a motorbike without an engine
On retrobike many mtb's look classy and not like motorbikes.
As for traffic, it's actually not that bad if you are confident and hold your own and make your intentions purposefully instead of wobbling round that parked car.
I got far more more animosity from walkers when I mtb'd than I do from drivers. There was always some walker up for an argument about how we shouldn't be there (on bridelways!) or how were chewing up the track. The worst was from some young women giving us an unjustified bollocking while her dog was loose intimidating sheep, despite all the dogs-on-leads signs. I can't be doing with rowing on leisure days
You dont get animosity from car drivers because most of the time they dont register your even there which as the OP stated is a major part of the problem.