Okay, I run into this problem more often than I think I should being an adult amongst friends who are also adults.
In an argument, you should be looking to defend any points you hold true with facts – not insults.
You should be able to accept someone’s retort, process it and present a valid counter-argument if there is one.
You can not say something politically charged and not expect a reply. Period. It doesn’t work that way, I’m afraid.
Calm, rational debate should always be the order of the day.
By mentioning Nazis or any other thinly veiled insults you fail.
See Godwin’s Law. 
Also, do not abuse Godwin’s Law. 
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