I don't need to state the obvious (but I will): boys and girls are SO DIFFERENT! My own personal examples:
Caroline is emotional. If you tell her "no," even nicely, she WAILS and wails and wails. Sounds like me! Any criticism, even in the form of constructive criticism, wounds my spirit. This week she also said her first word! While holding the remote up for a phone she distrinctly said "he-yo!"
On the opposite end of the spectrum, Eli is a man's man. If you tell HIM "no" he looks straight at you and farts.