Suppose that you were stretching and accidentally cold clocked someone nearby. Does that person not have the right to be angry at you for doing so, even if it was an accident?
Sure, a person has the "right" to be angry at whatever they want to be angry at.
On the other hand, an intelligent and mature person might make the distinction between being angry at being hit vs being angry at the person who did something accidentally.
In your example, certainly most of us don't want to be hit and being hit might result in anger... but once "we" learn that the hitting was an accident, surely we would not be angry at a person who did the hitting accidentally. After all, why were "we" standing so close to someone who was stretching? And why would "we" treat the accident as if it were an intentional assault?
Granted, there are occasions when people are acting unintentionally but very recklessly... that might well deserve some anger towards the reckless person.
As to "accidental racism": What is "accidental racism"?
> Not being racist, but saying something that can be construed by others as racist?
> Being a racist, and publicly saying something that can be construed as racist?
> Something else...?