I mean you wouldn’t think twice about running from a chimp or gorilla, or any other dangerous animal for that matter. I don’t think running is cowardly at all, especially from something as dangerous as a nigger.
And most animals would rather run to avoid possible harm, even tigers and bears. If cornered and you still do nothing then that’s when it becomes cowardly.
It isn't necessarily cowardly to run away from someone being aggressive to you, regardless of their race. Even assuming you
could take them on a fight and defeat them, running away
still is not inherently cowardly. In that event, one is not running away because they are weaker and afraid of losing the confrontation, even should others present potentially falsely perceive it this way.
What is the result of running away? Assuming the aggressive party does not follow and pursue you and chase you down, you've successfully ended all possibility of conflict and further issues. (of course, one scenario where it could potentially be the most pragmatic course of action not to run away is if you beat up the guy and then from that point forward he doesn't bother you anymore, whereas if you ran away he would still continue to pursue you.)
But if you get into a fight with them, again, even completely assuming you would physically best them and be successful, it could open up all sorts of problems: the public and police could notice and get involved. The people who know the guy you beat up could then come after you later. Not to mention, perhaps the person who runs away simply does not want to injure the aggressive party; perhaps the aggressive party is suffering from mental illness, so on top of that, it could be the unethical course of action. Disappearing from the scene in this scenario is the best course for all parties concerned. Perhaps also he simply can't be bothered; it isn't worth the trouble.
In conclusion, running away
could be cowardly, of course, but it could very well be the most pragmatic option, and the person doing it could not either be lacking in the physical capacity to defeat the aggressive party nor the courage to do so whatsoever, but just following the most rational course of action. It could even be argued that merely deciding to fight for its own sake due to the insecurity and
fear of being seen by others as "cowardly" is
more cowardly than being the bigger person and retreating from the scene in the best utilitarian interests of yourself and everyone,
irrespective of how onlookers or peers could socially judge this with uninformed superficial presumptions about you.