Hart insists he is mentally strong as ever.
"People are free to criticise or praise," said Hart. "I'm never going to tell anyone what to say or do about me but at the same time I don't have to listen.
"I'm pretty strong with how I feel about what I should and shouldn't have done.
"The beauty of football, and why it's such a big industry is it gets so many people involved because people are allowed their opinions."