All 'keepers make mistakes. Keeper errors tend to lead to goals. As mistakes go, yesterday's isn't in the Meslier class as there were mitigating circumstances in Roberts getting in the way / Pat not getting a call / ignoring the call. Patto should still have claimed the ball and must take responsibility for the goal.
To balance the error, he made two saves that were beyond routine. We were a bit below par across the piece. You can't win games if you don't score goals.
On a slightly different tangent, I vaguely remember seeing a stat that claimed we'd scored the most OGs in the division.