You can disagree without making it personal. The point is the problem, not the person.

Once an argument moves from the idea to the person, nothing useful can happen, because now everyone is defending themselves instead of thinking. It also guarantees that nobody changes their mind, since changing it would mean conceding something about who they are. Keeping the target on the claim leaves both of you room to move.

Use the specific thing rather than the label: I think that number is wrong, not you always exaggerate. Ask one real question before answering. The conversation stays useful and the friendship survives the disagreement.