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It comes from gaming originally I think, where someone might complain about a mechanic in the game or tactic the other players use and someone responds with "skill issue" basically blaming the person complaining rather than examining whether the game has issues or not. Very common in very competitive online games, but outside of that I think it is mostly used ironically.
Thanks for explaining. I thought it had something to do with gaming. That's one of the reasons I was reluctant to use it.