Oh, I agree, there are definitely lines. However you can sneeze in the wrong direction and have someone cry they are offended too. Kind of like the cancer argument here. Saying something is cancer or cancerous goes way back and is commonly used both in and out of games. But that doesn't stop the OP from being offended by it. My dad died of cancer. My dog died of cancer. But its a completely different usage. Still can't stop the offended.