You were definitely angry given your comment here "If you didn't want to discuss that, then you shouldn't have brought it up."

If you weren't, we would just discuss normally without insulting that the other side didn't have intention to discuss in a discussion forum.

So, somehow my comment angered you that you had to resort to the tactics of undermining the other side.

They were expressing a normative statement about an observation they made; that you took it as an insult is your problem. You brought up Palestine, then said this discussion isn't about Palestine. Indeed, if you think something is not relevant to the discussion, you should not bring it up in a given discussion.