Perhaps sometimes your brother sees some bad behavior when he is out, and he will find it very new and imitate it, and he does not know whether it is good or bad at all, so when When he knew he had made a mistake, he didn't dare to say it, so he had no choice but to put the blame on you. As an older brother, he was actually his younger brother's scapegoat.

On the other hand, maybe you did something unintentionally and he happened to see it, so you imitated it.