No, it did not. Unless you count the Soviet POWs who were murdered in Stalin's gulags.

https://en.wikipedia.org/wiki/History_of_the_Jews_in_Finland...

I couldn't care less if this person's grandfather was a Nazi, even if it turns out to be true. What are they supposed to do, go back in time and convince their grandfather to change their ways? It ridiculous using this as some kind of insult, and it disturbs me that people might take it as one.