Strange criticism and etiquette

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kell1066

 Just a question about a criticism from an opponent I received recently and I didn't know what he was talking about. He beat me 3 of 4 games, but after the last game, I offered a rematch and instead he lashed out with the following:

  "u suck u power check the whole game ...wack opponent."    I was trying to get him into checkmate but the clock ran out. 

What does that mean?  Am I being discourteous or is he just a sore loser?  What is "power check"?

kell1066

Thx kaynight. Kinda figured that but just wanted to be sure.