never invite Hitler to a barbecue he smokes the franks too much and has a weird obsession with mustard
Do you really mean this about Hitler?
It's just a joke and I mean no harm by it. Hitler was not that bad, before he fell out of power.
You shouldn't make light of Hitler's crimes as he was doing plenty of bad before he fell out of power. Jews getting killed in a gas chamber shouldn't be made light of either as some people still alive have traumatizing memories of such events. It may cause them emotional harm.