Any sort of harassment of anyone while running is completely wrong obviously.
That said, I do wonder if the stats are not accurate.
The report should say "One in ten women [who answered a poll] say they have been spat on while running".
It was a poll, not a randomly selected group of runners. I imagine those who have been spat on were more likely to respond.
I have been a runner all my life. I do not live in a city. I have never had any bother at all. I have not heard of anyone in my running club being spat on.
I am not minimising the issue, but would prefer it to be investigated and reported accurately.