No one was trying to be rude to you, pointing out mistakes is important. If I went to see your car thinking it was a GT then on viewing I noticed that there was no CC or electric seats, i'd think the seller was dishonest and walk away. If I noticed in the photo's that it wasn't a GT I wouldn't even view it in the first place. It's a simple error to make if you don't know all the differences between the base and GT model.
GLWTS
its not a problem mate! id rather people told me so i dont look like an idiot in front of buyers!