I am a senior three girl, and my deskmate's family is poor. Although I am not a rich second generation, I don't worry about food and clothing. She refused to talk to me, just like this morning.

From this point of view, this is not your problem. Some people born with insufficient family conditions will be distorted by the small living environment. You don't have to care too much about her attitude towards you, and you don't have to care what he slanders you. Just do your own thing. Of course, when he breaks your bottom line, you need to tell him that you respect her and ask him to respect you.