Because the definition of Nazi is applied so liberally that Winston Churchill himself would receive the label from those who use it in today's discourse.
I don’t think the fact that some people call everybody nazis should lead us to decide that actual nazis are now OK.
I don't trust that your definition of an "actual nazi" isn't significantly colored by your own prejudices. That we could actually agree on who are the extremists in society who are equally damaging.
The comment you are replying to does not even attempt to make that judgement. Use your own definition if you'd like.