Why is spitting so bad?

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

Why did people spit more in the past? - Quora

Do you spit? - Quora

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

Why is spitting so bad?

The alpaca spit dance: The disgusting consequence of getting caught in an alpaca food war

Is spitting bad? if so why? : r/AskReddit

Someone accidentally spit in my mouth. What are the possibilities that I get some disease? - Quora

Why do many Westerners like to spit in public? - Quora

6 Causes Of Sticky Saliva & Home Remedies

Why is spitting so bad? - Quora

Is spitting mostly a bad habit or is there something else going on? - Quora