I recommend watching a minute or two leading up to his chimp out (like 2:01:00 or so), it's so much more jarring.
He's sitting there calmly and talking about how Az and Eric don't have chemistry, he plays the clip of them laughing and having a great time together, and then out of nowhere he flips the fuck out. Fat sad man sperging out all alone because two dudes he can't stop obsessing over were having a great time together. "I truly can't take anymore of this." Cool, go finish your comic book then, stupid.