You forgot to mention how butthurt he got over the critique on his Octopath video that he decided to dance around the complaints that people had over him in his sequel video about game journalists. He's a prime example of someone that can dish it out but can't take it.
I thought his point in his game criticism videos were that a critic's value lies in the consistency of their voice and opinions, and that giving genuine, personal criticism of games is fine and more honest in a world where most games, regardless of their flaws, get inappropriately awarded 8's and 9's because anything below that is perceived as just "it's bad."
I remember when Octopath was new, and it got a lot of hype and praise, because it was novel to see a classic-styled JRPG with a unique, modern aesthetic, along with its idea of having eight characters that all form a party and have their own fleshed-out stories. I tried the demo for it and went "This is the most aggressively generic and boring writing I've seen in a while." After that, I asked "Well, do they at least take advantage of the cast of eight characters and have them interact in cool ways?" and the answer I got back repeatedly was "No." So, beyond its aesthetic and maybe some unique gameplay innovations, I couldn't see the appeal.
Yet, some people are surprisingly passionate and defensive over that game, and more power to them. If they enjoy it, genuinely think it's fantastic, including even the story and writing, then I'm glad they do. I'd rather live in a world where people enjoy things more than they criticize things, since I find a world with more joy than pessimism to be appealing. But not everyone has the same tastes, and sometime criticism is warranted, even if it's not something that you or others are able to overlook.
My three favorite games of all time are games that it's not uncommon to see get bashed--by those series' own fans. Over time I just learned to try and not be so defensive and understand that everyone has different tastes and opinions, and that the things about the games that appeal to me just don't always appeal to everyone else. Sometimes opinions can be genuinely poorly formed and factually incorrect, but that's when the evidence in support of that opinion is inaccurate or being misremembered. But if someone just plain doesn't like a game I like, or actively attacks it, I find it's generally not worth starting an argument about.
I don't agree with all of Dunkey's opinions, nor do I agree with all of Yahtzee Croshaw's opinions, and he's way more negative than Dunkey. But I still respect and appreciate a lot of their insights into game design and the industry, even if their taste in games is not in line with my own. Just because I disagree with a lot of their opinions doesn't mean I can't agree with any of them. Valuing people solely by how much their opinions and views agree with yours is rather close-minded, so I try to at least see where people are coming from and learn from their opinions instead of just dismissing them outright.