That being said, superhero comic books tend not to feature such casual intersectionality of ethnicity, and especially not when they're doing flashbacks to the WWII era.
Still, having a Jewish best friend in the 40s was still fairly progressive.
Maybe my mind is manufacturing things, but I could have sworn that someone who Actually Knows Things alluded to Ben Parker being Jewish? I mean, May is obviously Irish ("Reilly" is a pretty clear giveaway), but I seem to recall there being some debate about whether Peter is Jewish, due to his heritage.