That's from when he was invited to play a song on stage with Blue Oyster Cult. Somebody found the video and posted it on the subreddit and pointed out that he made an absolute buffoon of himself - peacocking all over the stage with this guitar turned way too loud. You can see the singer being visibly pissed with him at the start of the video and asking him to turn it down, only for Joe to completely ignore him. Ruining that memory for Joe is what made him absolutely lose his mind in the final days of the subreddit. You can read some of his insane ramblings here -
https://opieandanthonyarchives.com/reddit/user/IntlectualHomosexual.html
That was just one of his accounts too. He was sperging all over the place on multiple alts in those final few months. God he was he a fun fucking cow.
Here's the full video -
Highlights
0:15 - singer tells him to turn his shit down and is completely ignored
2:27 - Him mimicking the cymbal crash will never not make me laugh
4:56 - "Get this old faggot off stage and never let him back on again"