Why is spitting so bad?

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

Can Bugs Spit, Puke, or Do Both?

Merseyside Police chief angry at 'louts' who spat on patrol cars - BBC News

Covid-19: India's unwinnable battle against spitting - BBC News

Spit socks and spit hoods: Here's what they are and how police use them

Psychology of Spitting on Someone

Is spitting every now and then bad for your health? - Quora

Why do some people spit while talking? - Quora

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Why is spitting so bad?