It's odd for me to meet or even hear of such people.
The language my family speaks around the house, our native tongue, is called Ladino. For those of you who don't know, Ladino was once the mostly widely-spoken Jewish language in the world during the 20th century...until the Shoah (the word we Jews use for the "Holocaust").
Once the Shoah ended, almost 100% of European speakers of Ladino were gone. The language of Sephardic Jews from the Spanish Inquisition era, it was a mixture of Spanish, Aramaic, and Hebrew. Hitler did away with all the European Sephardic Communities during the Shoah, and with it the speakers of Ladino. Being that most Sephardic Jews are darker skinned that Ashkenazi Jews (and the Ashkenazi's had Germanic blood), this may have been a reason why the Sephardic Jews of Europe went first.
I grew up in an area surrounded by Latinos, thinking I was one of them as a child. But I do remember being teased for my "weird Spanish" and even scolded by adults like teachers who would tell me that using my language with its unique words "was a sign of your bad breeding, so you need to stop using them and change your ways." It was not until I was an adult that a language specialist uncovered that my family and I spoke Ladino. Our family had come to the Americas after the Spanish Inquisition, and we brought our language with us and have been speaking it ever since.
The point is, the language is not all we discovered from these experts in Jewish humanities. We learned that we were once related to millions of people who once lived in Europe until the Shoah. Aunts, uncles, grandmothers and grandfathers, countless cousins, all gone in about the period of a decade. I am directly related by Sephardic lines to over half of the Jewish victims of the Holocaust. In most cases all I have are photographs of people I will never meet, most of these photos hanging in museums.
If the Holocaust has not happened, my language would not be rare. Today it is estimated that around 100,000 native Ladino speakers remain, and despite recently efforts the language is dying and may soon be extinct. The communities where my European relatives once lived, many in Budapest, were emptied of Sephardic Jews. There are visible traces left, but little more.
The Holocaust is real. It did happen. Today I am somewhat isolated because of it. Most Jews you see in the Western world are Ashkenazi, and the customs and language (Yiddish) are theirs. Except in Israel, I am for the most part on my own when it comes to being a Sephardic Jew.
This is all due to something that Holocaust deniers have to lie to themselves about. The idea that I could claim 3,000,000 plus people as relatives, all who disappeared with their communities and language in about ten years is a horrible thought. Some can't face it. Some won't.