Well then, the US and Israel are also Nazis, right?

No. Not right. The original Nazis based their crimes on a belief of racial superiority. They invaded other lands to kill the sub-humans living there. Not just BTW, the Right Sector political group/party in Ukraine has the stated goal of killing all the ethnic Russian subhumans to racially purify "white" Ukraine.

I couldn't find the quote I was looking for, but here are some pre-war links to western medial about Ukraine's Nazi problem.

https://www.bbc.com/news/world-europe-27173857

https://www.ibtimes.com/svoboda-rising-spectre-neo-nazism-ukraine-974110

https://www.bbc.com/news/magazine-20824693

In the last picture of the first link, you can see the Svoboda party followers wearing Nazi armbands. In the second link the far right Ukrainians are ranting against "the Jews" in Ukraine.

These are real Nazis in Ukraine. They have been Nazis straight through from WWII till now. They never stopped being Nazis.

Calling people Nazis who aren't Nazis (and "behaving like a Nazi" or calling someone a Nazi is a distinction without a difference) makes it that much harder to get people to take serious the charge of being a Nazi.