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by itsovermyhead 1947 days ago
I think you're misinterpreting the sentence, I did too when I first read it. He's using plain old, as a reference to normal or regular.

Like, I just wore a plain old shirt to the concert. Meaning, I just wore a regular shirt to the concert.

In this sentence, it means, "or just the regular reason of 'you're not doing a great job'."