Would the glasses have made German shout "Sieg Heil!", goose-step, and start burning Jews?
I'm german.
And I really don't find it funny.
First of all not all germans were like that.
And not everyone "burned Jews".
Back then it was like you conform or you die.
Only a few had the balls to resist like probably in any nation.
Well whatever.
As long as it makes you laugh.
But really it isn't that funny.