One of my students called me ugly and fat and he hates me. How can I get over that?😢🥺

I work one on one on him and he special needs. I am kind and fair to him and all the other students in the 1st grade class. He was throwing a fit like he always does because I refuse to let him do or get what he wanted. He gives me dirty looks and annoying looks when me or the teacher tells him “NO”. The teacher said, “Well guess what? You’re going to be hearing “NO” all your life so get used to it.” She told me the problem is that his parents give in to him and his sister and they ask why they act like spoiled selfish brats? Tough love is what they need.”
We are preparing students for the higher grades and setting them to the right direction.
We love these students but sometimes tough love is the way to do it sometimes.
I deeply care about this student and the other students but they seem like they can’t stand us sometimes. Sometimes we can’t stand them.
I can tell he doesn’t like me because I’m always on him when he’s wrong but I do give him high fives when he does a great job. We do smile. He yelled at me a few weeks ago, “You’re mean and ugly! I hate you!” That really hurt.
My older brother said this to me, “If a student hates you because you won’t get them what they want or don’t let them get away with anything, it means you’re doing your job. Your job is to get them to the right direction. They don’t have to like you but they need to respect you. Don’t be too serious though. They’re children. They say a lot of things and most have no filter. Don’t take it too personal. Stop being so sensitive, toughen up and do your damn job. Well his life he’s going to have teachers tougher than you so basically you’re getting him and the other kids prepared.”