I chair tribunals. One of the precepts is that every decision is nuanced and context specific.
You simply can't take one part of one sentence in what is itself a nuanced decision, and apply it as a blanket rule to an entirely different context, in a different social setting, with different power dynamics.
That's just not the way it works.
You can (or the delivery driver could, at least) have their lawyers argue that KJK's words were gratuitous, overstepped the line, and thus constituted harrassment.
At least, they could if there were a tribunal system for grocery store and customer disputes. Which, as far as I know, there isn't.
Equally KJK's lawyers could argue that her words were the expression of a legitimately held belief, made in the context of a political conversation, initiated by the driver, and were thus entirely reasonable.
Those are both legally arguable positions. But they need to be argued. You can't just take a snippet of a sentence and use it as a mantra to declare your position true. That's not the way it works. Context matters.
And that's why the lawyers earn the big bucks.