spit-poison

[…]a vile person comes to be understood, and then to be abhorred, and to be pointed at as he passes by with such kind of elogies as these; "There goes a person for whom no one breathing was ever the better, but many ruined, blasted, and undone; the scourge of society, a spit-poison, a viper, and to be abandoned and shunned by all companies, like a mortal infection[…]"