Why people assume that you are angry with them when it is not true?

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There are people who assumes that you are angry with them but you are not. No matter how you tried to ignore it and not to think about it, they still make this an issue until you become the bad person. Ignoring it does not imply that you do not care about it but to stop the issue. Why do they do it? When you even do not know why they are telling that you are angry. Is it because they are guilty about it? Maybe that was the reason but what I do not get is why do they still have to make it a big issue? An issue that would not stop until it gets worst because of people who assumes too much.