are mean to me = treat me in a spiteful manner.
If someone is being mean, they are being unkind to another person, for example by teasing them, calling them names or not letting them do something.
They are being bullies.
‘Mean’ is often associated with the expression ‘mean trick’. If you play this sort of trick on someone, you are being unkind, cruel and hurtful. The idea is that you want to hurt someone mentally and you do this in an underhand way.
Good morning, I`m glad to see you Reading your explanations I have a feeling that I study at Oxford. Really with your course all the dreams become true!!!