Why is spitting so bad?

Why are people so upset at the video of football pundit Jamie Carragher spitting?

Why Men Spit Before Urinating in Urinal or Toilet - Dr.Shem

Do you spit? - Quora

Why do people spit so much on streets in India? - Quora

When we smell something awful, why do we usually spit? - Quora

Is Your Vape Spitting? Here's How to Fix it!

Why is spitting so bad? - Quora

Covid19: Candhuuf tufka iyo Hindiya maxaa kala haysta? - BBC News Somali

Why do we spit when we smell bad odours? - Quora

Why do men spit when they pee?