Once I told my mom that I was sorted into Slytherin on Pottermore and she went into a big rant about how awful Slytherins were. I'm the only slytherin in my family. Everyone else in is the other houses
Because it's hard enough to be the brainy girl. But to be the brainy weird girl, find a place where even though you're rejected by some you're still the friend to others.to be threatened with losing that.