I'm going to make my ex cry after flipping me off every day
Can you explain more about this situation? Why do you want to make them cry?
Yes, last year, we dated and we were lovers too, we broke up with each other later, and now he's trying to play nice after what he did to me is just ridiculous.
While it's not good to be cruel to someone to make them cry, it's ok to confront them if they did something that upset you. In this case, it sounds like you have a good reason to confront him since he was rude to you. I still think it would be best to try to be gentle when confronting them.
It's fine, I've already made my decision. I want to see him cry.
It's understandable to be angry given that he was rude to you by flipping you off. However, intentionally trying to upset him will just make things worse between you two. Instead, I think it would be best to politely and calmly talk to him about how he made you feel. Then you two can work through this.