He also insisted that the call to give his side a penalty, from which Craig Gardner levelled, was fair.
"We had to respond because we were behind within a couple of minutes and from our point of view it was a sloppy goal," BBC Sport quotes O'Neill as saying.
"We had to fight back and we got the penalty kick - it was a clear penalty. There can be no complaints there. Our play after that was fantastic."
The win moved Sunderland up to 11th in the Premier League.