I don't understand why do I need to prove he isn't "old money" old money is a pretty defined term unless you want to use it in the most ambiguous way.

Both of his parents worked (and unquestionably very hard) for a living and while lived a comfortable life it wasn't one of some extreme affluence.

His parents is what we would for the most part consider upper middle class or "working rich" it's not like Bills childhood could be a backdrop to a scene in "all the money in the world" or anything similar.

I've also never considered Gates to be a Satan or anything of the sort regardless of Microsoft's practices I've always have had an admiration of him as well as many other successful people.