Why are they booing you, you're right?
Turret's "serious" comment said that you claimed people should know about/have awareness of that Flesch-Kincaid reading level as a determinant of literacy....but you never said that.
I will admit I had to go back and actually read both comments because I tend to tune out long comments (many long comments are slavering diatribes not fit to store in any memory, long-term nor short). Maybe that's what's happened here.
They never said that. So maybe you're disagreeing with their reasoning because you don't know what it is.
They say billionaires are bad because they have a lot of money and don't use it to help people. This isn't even talking about billionaire who engage in actually/actively morally wrong deeds to acquire money.
If you produce a product so excellent that consumers give you 1 billion dollars ($1.000.000.000) in pure profit, there would be no problem if you kept a nest egg to ensure your livelihood and then used the rest to provide aid where it's needed. You would still be a bad person for sitting on it, instead of spreading it to help people that aren't well off. A person can live very well on $300K pretty much anywhere in the world: that means $999,700,000 is not materially improving your life and you are hoarding it for no good reason.