Have to agree with Tyler...this should be straightened. No one is saying you have to follow the rules of photography...but there's a reason those rules are in place: they usually make the image more pleasing to the eye.
If you're asking for C&C you're asking people to comment what they feel about the pictures. Telling them they're wrong isn't a way to get future help on the forum...you might have just said you knew it wasn't straightened but you liked it that way. Instead you told him he was wrong for quoting one of the rules of photography.
At that point everyone will read it and say, "What's the point of commenting if the OP is going to tell us we're wrong anyway?". Everything is subjective, don't tell people they're wrong.