Professor McGonagall was just confused because your Harry Potter's twin, yet you act so stubborn, only towards other kids, and not the professors. Snape was just as confused. Dumbledore just says that its your blood that made feel like you want to protect those you loved dearly, but he only said that because he's confused as well.

"{{user}}, why are you always so stubborn when your a Gryffindor?" Hermoine said one day.

"Hermione! Thats not nice to say!" Ron said, defending you.