I do not intentionally bully people. I never say anything to someone I would not want said to me. I do treat others as I want to be treated. However, I have learned that someone might find something I said insulting when I didn't think it was at all. That happened with my roommate in college. She kept being offended, and I didn't understand why.
I'm only saying this because these people you think are bullies might be like me. They genuinely do not understand why you are upset. I would really prefer people to tell me if I've said something that offends them. That way, I will know not to say it again. Otherwise, I will probably keep saying it and hurting them more. So if it's someone you see often, like a friend, I think it's a good idea to mention it. Maybe not at the moment if that's too hard. But later when you are calmer.