It's not literally him as an individual saying it this once, it's the large amount of it in total.

There's people who go around bothering flat earthers, but despite flat earthers claiming the contrary, they're quite small in number. No mass media effort, no corporate propaganda, no CEOs mentioning all the time.

The largest it ever got were things like the netflix shows. These are pretty illustrative; All of the big attention is not so much on "these people must be convinced of the roundedness of the planet" and more on the dissection of why these people refuse to accept something that is quite easy to prove across a wide variety of otherwise unconnected experiments.