Yours is showing too, along with an unhealthy dose of smugness. GP literally chose to be homeless instead of licking the boots of the wealthy for table scraps, which is a degree of courage above and beyond what could have been expected of him, but it was still courage. Saying that his ability to do this is privileged, is like claiming a man who saves a baby from a burning house is showing his able privilege: true, technically, but grosly unfair and an underhanded way of attacking him.

Why do you eat at restaurants that don't pay staff enough? If "some people" treat service workers badly, and you know this because you've seen it, why don't you tell "some people" that they're acting like pigs?

After the Spanish civil war was underway, tipping was made illegal within the Republic, and George Orwell reports that one of his first experiences "was receiving a lecture from a hotel manager for trying to tip a lift-boy". They had it absolutely right. A business model where staff get paid whatever their customers feel like moves all the financial risk from the rich business owner to the poor worker, emphasises the class differences between the two, and is generally a practice which anyone left-wing enough to be using the word "privilege" should find abhorrent.