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Williams could hardly believe his punishment because Pericard did not even fall to the ground but carried on running.
Williams will look back on his trip to the South Coast in horror because he handed Portsmouth their eighth win of the season with an atrocious own goal in the 38th minute.
Under no pressure the Northern Ireland international struck a fierce backpass towards keeper Kelvin Davis.
But Davis allowed the ball to go under his foot and over the line.
Rampant Portsmouth were ahead in the second minute when a long pass from Paul Merson picked out Pericard who turned to score with a left-foot shot.
Wimbledon always looked dangerous running at Portsmouth's defence and they equalised in the 10th minute when Joel McAnuff centred from the right and Neil Shipperley headed in at the far post.
But Portsmouth went ahead again on the half hour when Svetoslav Todorov headed in a centre from Matt Taylor.
After Williams' dismissal and with Wimbledon already 3-1 down, the match died as a contest, but Portsmouth were not finished.
In the 71st minute Taylor raced forward to score with a low left-foot shot