Spare us the terminology abuse. He was followed, perhaps even in a threatening manner, and verbally harassed. But certainly not hunted down.
It's unusual that someone just after a tense situation resulting in a "close one" with the grim reaper would... use extremely harsh language aimed at the person who caused it?
34 year old from Georgia, dad is a retired cop, we don't know much about him but seems like quite a blue collar type who owns a pickup truck and a shotgun, rather than someone who works in a corporate office in NYC or SF with speech codes and HR manager. So the social environment explanation is not as implausible as you are implying.
He was chased by two cars, on video, and hit by one of them. That's hunted to me.
As for the extremely harsh language, of course, that makes sense. You would use the words that fist come to mind. And if the first word that comes to mind is a racial slur, that says something about you.
Not using the n-word frequently, or be judged a racist, is hardly some onerous speech code. His use of a racial slur frequently, and in a derogatory way, shows clear racism. At some point, the guy is a racist. I wasn't calling him one before, because there was no evidence for it. Now there is. I'm not seeing why you chose this hill to die on, him being a racist is not just the most obvious solution for the data, it is the only really plausible one.
Happens with Soldiers in combat as well.
Saying every soldier is racist is not right
Soldiers in combat frequently devolp a soft 'racism' to them, directed at the enemy. It comes out of dehumanizing the enemy to preserve your mind. This 'racism' is included in calling the german's huns, etc, but usually isn't brought. If a non-soldier was doing that, I'd be concerned. A soldier's mind isn't a completely healthy mind, by design. There is a definite purpose to the 'racism' there, which is part of the dehumanization of the enemy needed to get someone who isn't a sociopath to willingly kill another. In a perfect world, this wouldn't be necessary, but then neither would soldiers. We don't live there, so we need this for soldiers to operate and protect America.
In contrast, this isn't a soldier, this is a ex-cop. Who was supposed to respect people of all races and serve them fairly, but instead loved his job because he doesn't have to deal with N-words (his words). Who constantly, verifiably, uses the N-Word on social media. Who we have no reason to believe about anything, given they did verifiably lie about what happened with Arbery, given the tape. Who shot and murdered a black man. How much more evidence do you need to declare a man a racist? This isn't some snap judgement over nothing, there is way too much evidence for this to conclude otherwise.