A nine year old girl needed hospital treatment after a bottle was thrown through the window of a car she was travelling in, showering her with glass.
Abbie Keers was being driven along the A693 in Stanley when she was injured.
Police have described it as a 'mindless act' and are appealing for witnesses.
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Speaking after Sunderland's 3-2 defeat, Moyes said: "It can't always be me leading them by the hand and showing them what they should do".
Hundreds have left the Civic Centre in Sunderland as this year's Sunderland Pride gets underway.
It happened after yesterday's football game, which saw Barrow win 2-0 against York City.