The goalless draw extends Southampton's horror form at home, having not scored at St. Mary's in 365 minutes.
Speaking to the club's website after the match, Redmond said: "We should have got all three points and we're a bit disappointed. We'll take the point but we've got to finish off our chances.
"If Gabbi scores the penalty on another then it changes the way the game goes but we should have made more of our chances. I don't focus on what Manchester United do or any other team.
"We focus on what we can do and when we're go back in the dressing room we're disappointed we didn't put away the chances we had."