What's the difference between Hitler and the Boston Bombers? The Boston Bombers ended an entire race.
Oh my. Is there something deeper that you mean when saying this towards me?
No, it's just a joke
Making fun of people who were victims of horrible atrocities isn't funny, and you should work on what you find funny. Some of these words that you're saying are very harmful to people and you need to think about their feelings as much as your own.
You sound like a child lashing out because you understand you're wrong and can't talk sense.
It is hard to find a joke about genocide and people being killed at a family event funny. We should not joke about tragedy but remember the lives of those who were lost in respect.