People have used that exact line of reasoning to subjugate other humans for millennia. History has not looked favorably on such reasoning.

"Fuck Geats. Geats are crazy"
"Fuck Shudras. Shudras are inhuman."
"Fuck Jews. Jews are crazy."
"Fuck slaves. Slaves are inhuman."

I might as well say, "Fuck green-eyed people. Green eyes are crazy!" It's lazy bigotry, it's ill-informed, and it's a poor, unsuccessful argument.

I could say, "Fuck Shannon. Bitch tried to stab me with a paring knife! She's crazy." but that doesn't lead to, "Fuck women. One tried to stab me with a paring knife! They are all crazy."