Do you ever wonder how many Jews would denounce that "Yiddishkeit" is a thing?
What do you mean by Yiddishkeit? I don't know what it means.
I mean, you know, Jewish culture, something like that.
Everyone has some type of culture. Would you want someone to boldly assert that the culture you developed didn't exist?
I don't think they would.
Everyone does not see things from your point of view. You should consider how you would feel if people considered your culture, values, and beliefs imaginary.