"Holocaust" is a term that was coined to refer to what happened to the Jews.
Respectfully, I disagree. The noun Holocaust has been used throughout the centuries to name such similar acts perpetrated against other peoples, be it on racial or religious grounds. It was not coined specifically as a consequence of the attempted extermination of Jewish people or people of Jewish faith, though I of course appreciate that in the modern context it is in general associated with same, and, undoubtedly, the Jewish people were unparalleled in terms of the savagery and methodical nature in which the Nazis sought to exterminate them and in terms of how many actually perished relative to other groups of people.
It ought be borne in mind that, as one example (other than his plans for Jewish people per se), every Pole (regardless of faith) was, in Hitler's own words, to be killed without mercy or pity. This was attempted, though he was stopped, which meant that people such as you and I are now alive.
In my view, there should be no commodification or naming rights to the term Holocaust, notwithstanding the fact that the Nazis were variable in their zealousness with the speed and manner in which they killed those different people that were subject to it. To do otherwise would arguably be a denial of a remembrance of all those millions of others of different race, nationality and religion who perished under the Holocaust - they should not be marginalised because of a perceived naming right. All the murdered during the Holocaust shared a common killer - they should have at least the dignity of sharing a common remembrance of their passing and a common condemnation of those who sought to liquidate them.
I know that millions of Poles, Russians and Germans were killed during the war. There is a name for that and it's "World War II". What the Nazis did to the Jews was not done in the course of fighting the war, it was done in occupied areas after the front moved on.
Again, I disagree if you are suggesting that it was just the Jewish people who were murdered in occupied areas after the front moved on. If so, this is clearly untrue. I'd warrant that nearly every member of this forum whose lineage lies in Central/Eastern Europe (for example) had a family member/descendant or knew of someone close to their family who was murdered by the Nazis in some form of operation nowhere near the front lines, and not in the course of what we loosely refer to as 'dying in battle'.
But when defending Poland, it doesn't have to be done by insulting Jews. That only reinforces the impression that your trying to change.
Would you please explain what you mean here, particularly in respect of the insult you refer to?