If your 3-year-old son wants to be a single lady, you best let him be a single lady. DO NOT deny that child the joy of telling an ex to go screw himself.
When this kid sings, "Just cried my tears, for three good years", he freaking knows what he's talking about. Years of tears, people. Beyonce shares that experience with many toddlers.
Leave it to the kid's father to nitpick a little thing like the word "lady". Thanks for the buzzkill, Dad.