It sounded like a total disaster to you at the time, a real trainwreck? And one of the band agreed with you? As opposed to just acknowledging they made a few mistakes?
Then I must have been at another show with another bunch of people watching a different band. The people around me were still pinching themselves trying to believe they were watching Zeppelin after all these years, OMG Jimmy's got the bow out, not "well, that sucked, try harder with the next one." So it wasn't note-perfect, I didn't meet a single person that night who gave the slightest inkling of a damn.