Why are some scorpios so dumb?

I love scorpios but some of them are such dumbheads especially the ones born in November. I had a teacher 
born November 19th she was really sweet but wasn’t very smart. Like for example she would not erase the board till the next day, repeat everything you say, copy what you do, follow you where you go (not all the time). And she was also a bit childish like she would give you tight teddy bear hugs even when they aren’t really needed and say “yay” or “oh no” as if we are in kindergarten. My mom, math teacher and classmate are all scorpios born in October and they are way more mature and have more sense than the November scorpios I know. Like I said I have nothing against scorpios, I get along with them very well I just think they are a bit unintelligent.