I always thought it was odd when I'd tell people I was a mathematician and they'd respond with how much they hated math. I mean, if I meet a novelist, I don't say I hate reading or fiction. It's rather rude
Two things I often say in my classroom:
1. It's okay if you're wrong. I just want to know what you're thinking.
2. Remember, we're on the same team. I'm here to help.