Calling someone a name. Being rude or insulting. Having unresolved issues about a topic. Jumping to conclusions or taking offense without requesting feedback. Many people fail to distinguish between anger and the real emotion they felt when they read something.
Conflict is inevitable.
It's to be expected. To sit on one's feelings and stew is not the solution. The words we choose are important and the way we say them is important. Then it would be a good thing to rephrase what you were going to say.