Somebody please reverse explain it to me, I know cosmic horror but I've never before heard of this Horton

I loved the scene is Horton hears a who where all the whovians realize their utter insignificance, leading to public mass suicide

"Yeah. Like Horton Hears a Who. But imagine if Dr. Seuss was such a horrible racist, the KKK told him to chill the F out."

As amusing as this is, unfortunately no.

Cosmic horror needs both cosmic and horror.

Neither of those two stories are written or generally interpreted as horror.

Is there a Community for cosmic horror yet?

What is Horton hears a who?