I found him super annoying and cringy. Whenever someone wanted me to watch one of his videos I would go through this whole mental episode in the span of a second or two before trying to excuse myself from that.
He was a decent youtuber, but I was always irked by his propagation of the "That's just a theory" phrase. I get that it was just a tagline, but it still inadvertently promotes the downplay of the scientific process.
The word "theory" has definitions outside of the context of the scientific process, and it's pretty obvious that MatPat was not doing anything scientific in his videos. I don't understand the concern here