Reductio ad Iudaeum

Dismissing an argument on the sole basis of some superficial analogies and/or alleged connections with the Jewish race or the jewish elites.

General form:
"A sounds jewish, therefore A is wrong."

Typical example:
"I think nationalism is wrong."
"You know who also hated nationalism? The Jews. Are you siding with the Jews?"

Just because something was done/said/thought by the Jews, that doesn't automatically make that thing inherently "jewish", and even if it did, that alone doesn't automatically prove it false or bad.