What else is being lied about?
A great deal and on both sides.
Some Marxist agitators on PolishForums deliberately want to mislead the public by pushing the notion that Jews in Poland were always victims. That these so-called passive overachievers did everything to contribute and integrate but Poles kept holding them back and knocking them down.
Of course these repeatedly told boldfaced lies are always purposefully spread propaganda.
For instance, many Jews in interwar Poland were attracted to Zionism because it "offered them a way to come to terms with the modern world without surrendering their ethnic identity."
Link to the above quote: academic.oup.com/jcs/article-abstract/25/2/371/830303?redirectedFrom=PDF
How very telling that as recently as the early to mid 1900s there were many Jews residing in Poland (with some still alive today) who admittedly never identified as being Polish and actively sought avenues and safety in numbers so as to protect and preserve their Jewishness rather than integrate into wider Polish society.
Fast forward to today, where this same Zionist movement has its own foreign homeland in the Middle East, and there are now very serious and publicly admitted misgivings, doubts and hurt among a much younger generations of Jews: "as a Jewish person, I was fed a huge amount of lies about Israel my entire life."
Link to the above quote: jacobinmag.com/2020/07/seth-rogen-israel-occupation-palestine
If young Jews are being told lies about Israel by the adults in their own community, then the blatant lies that are being spread about Poland by visiting Jews to your high school only proves that this is a well funded, well coordinated, and very sinister program at play.
Anyone who supports Zionism while hypocritically decrying Polish patriotism or nationalism is never, ever, worth listening to. They have no credibility whatsoever; right off the bat.