Who is Mr. Morrow, and why does MandaloreGaming have such a visceral reaction whenever his discord chat starts posting his face?

I'm watching Mandy's old RING 2 stream VODs (because I like watching grown men fail at slide puzzles, don't judge) and he lost it when the Lowry chat started posting gifs and photoshops of Morrow. I know that every single Lowry post is an incomprehensible rabbit hole of in-jokes and references, but I have nothing on Mr. Morrow other than the one appearance in his SOMA video. What context am I missing?