I think the only concert I ever walked out on due to abject disgust was a George Thorogood & The Destroyers gig in the early-mid 80s. I got in for free for some reason or another...it might be that the buddy I went with paid.
I already wasn't a fan of the guy, but after about a half dozen songs that all sounded alike and a half dozen or so meth head looking trailer gals flashing their teats at the stage, my friend and I just looked at each other and took off.
I've left shows for other reasons before, like I had to get somewhere, but I can't remember another show I just thought sucked so much I had to split.
I saw BB King in Tulsa sometime in the 80s. Was looking forward to it but it was one of the worst shows I've ever been to. He played for 18 minutes and left. I don't know why, but even that 18 minutes seemed too long. Maybe he was just having an off, off night.
Around the same time I saw John Lee Hooker at the Cains Ballroom in Tulsa and it was an incredible show.
And speaking of Judas Priest, I saw them with the band Heaven opening sometime around 1982 or 83 I guess. I was very, very happy.
Sometimes it is cool to have some age on you, but I took an awful lot for granted back then...mostly my health and mortality.