Some do. Some do not. You are projecting. If you believe what you is there not someone in your city, province, state that you can kill tonight because they speak Arabic ?
When I was a kid we were out playing Israeli Army during the Six-day War. I mean literally during it. My parents told Arab jokes. I repeated them. We weren't ashamed of wanting Israel's enemies dead.
Arab jokes, Mexican jokes, Jewish jokes, Polish jokes; same behavior different targets
Sometimes objectifying the enemy is a very good thing.
And I don't think this world is a better place since any mention of ethnicity has been proscribed.