Reading these threads has opened my eyes.It really does seem that there are plenty of ignorant people using the path whether walking or running or cycling.
That's it in a nutshell. There are ignorant people everywhere, all of them utterly convinced that they are 'special'.
FWIW, I'm a relatively new runner (started couch to 5k a few weeks before lockdown began) and in the last few months have only really noticed 2 or 3 people being selfish. One was a runner, who was standing on the pavement and saw ds2 and me coming, then chose to start running towards us. I honestly thought she was going to go around us, into the road, but she didn't- she went past very close on the pavement. The other two were 2 women who stopped, with dog on lead, on the corner of a road we were turning into, which meant ds2 and I had to go wide, into the main road, to avoid them.
That's it. The rest of the time, whether walking or running, or even on the one bike ride we've done, nearly everyone has been courteous and even friendly.
One of the things I have always disliked about Mumsnet (and in RL too, to be fair) is the tendency for some people to exaggerate for effect. Hence the odd selfish runner/walker/cyclist becoming 'all runners/cyclists/walkers'. It makes me suspect that the poster (or person) concerned is actually the ignorant selfish one in the scenario they're describing.