You’re a Nazi. I used to be a Nazi too so I should know.
Discussion
It's in one group's best interest for Nazi to be a slur you can throw around with the weight of 6 million deaths behind it.
Unfortunately Socialist is a much lesser insult despite having 60 million deaths burdening it.
From the 1901 Jewish Encyclopedia:

Is it one groups interest (dog whistle the jews). Tell me how you arent a nazi again and how its a word without meaning? Just one more time
Anyone who is not a nazi should be able to tell that you are in fact a nazi.