To be fair, there are a very large number of people suddenly discovering "walking" due to time, boredom, cabin fever, whatever.
In China spitting was made illegal due to a previous outbreak. It should go without saying that joggers ought not to do this - and in all honesty I've rarely seen it.
So there are a considerable number of people on footpaths who have not walked in a long time, if ever. It can feel annoying, but if you are a dog walker to jogger you might also feel aggrieved that your longtime "route" is suddenly crowded with quasi zombified families shuffling along while gawking open-mouthed at all the things around them they have never seen. Liekwise, the men-children on bicycles trailing along footpaths and the wrong way up one way streets who have forgotten that they are no longer 8 years ago and should treat a bike like a vehicle. People who previously walked an effective 5km per day going to work might be housebound, may not have gardens or may live in a very small unit, or share with many others. We all have to be considerate.
Its perhaps time for us to be more tolerant or others and remember that space is not unlimited and we all need to allow each other space.