I'm glad you feel that way
You say this when you don't care what the other person thinks, but you still act like you're happy about their dumb opinion just to avoid a fight.
'I'm glad you feel that way,' he said, then went back to watching cartoons.
'I'm glad you feel that way,' she said, even though she had no idea what he was talking about.
'I'm glad you feel that way,' he said, then started eating pizza with his hands.