Always have that in the back of your mind...when they approach, I move away. Don't say a word, don't let them elicit a response from you. Be expressionless. Let them scream all the tripe at you that they want.
If you can't get away from them, and they are touching you, or spitting on you, or coughing on you...defend yourself until the threat is no longer a threat. I do not think there is any court that would fault you for that, as long as you made your best attempt to keep away from them.
Use your eyes and your body language to convey that you are not going to take any shit. Silent intimidation is the most effective intimidation.
People who have a plan and are confident in themselves have no need to call people names (snowflake, sheep, libtard). People who exhibit their anger publicly and whine about their freedums being taken away by a mask are weak and undisciplined.
Have quiet confidence. Have no fear. Everything is going to be alright. 
PS...I'm talking here about when strangers mess with you. Things have to be handled a bit differently when people you know are approaching you out of sheer ignorance.
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