It is assault.
You can also be sued (in Civil Court) for unlimited funds if you give the person you spit on ANY reason to suspect you may have a communicable disease, since that may put them "in fear for their life". You should also be aware that if someone genuinely DOES "fear for their life" as a consequence of being spat upon, in most communities they can KILL you and not be found guilty of murder! It's also just plain gross and disrespectful.
Yes
In most(all?) states it is against the law to spit (expectorate) in public. It is a public sanitation and health (bodily fluids) 'thing.'
no
It is against the law to kill anyone, REGARDLESS of the circumstances.
Challenging someone to a fight is against the law. It can be considered disorderly conduct or disturbing the peace and is a misdemeanor offense.
Yes it is against the law, because by running someone's credit without permission is committing Fraud.
Yes, it is against the law to threaten someone. Threatening behavior can be considered a form of harassment or intimidation, and can result in criminal charges.
Because burying lliving people is against the law.
Yes, discrimination is against the law.
Yes, it is generally against the law to take pictures of someone without their consent, as it can violate their privacy rights.
The law against killing someone illegally.
No.