The England winger's substitution was greeted by ironic cheers during victory over Champions League opponents Shakhtar Donetsk.
He told the Manchester Evening News: "I didn't hear the applause (when subbed against Shakhtar). I didn't hear it. To be honest, I think you always have a bit of criticism now and then, it's the way you take it.
"I'm a positive person. I always want to play well and go and show the fans how I can play. The fans have been brilliant since the day I came here.
"We want to do well for them. They're here week in, week out, singing from the first minute until the last. If we can build on this result and keep the momentum going then I'm sure they'll be happy."
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