Help me out, I have really toxic relatives

My cousin brother recently got a job which pays around 17 lpa, its not even a month and his mother has started to insult me saying what i have ever achieved in my life 🤷🏻‍♀️ (I am a research fellow with a qualification of a professor and I love my research work)

My aunt wasn't doing well untill now, and our family always supported her, in her health, family issues, education of her son and daughter and what not......and as her son got this job she got all rebellious of me existing.

this happened yesterday, when we were casually talking abd I said I am not interested in cricket and I would rather study or read something, and she got all rebellious and told me I don't stand anywhere around them and I am a total failure, she said nobody will ever notice my research articles and they have no value. She was soo rude and all of this behaviour from her was completely unexpected. I cried for hours because other people of my family were also listening silently but gave no reaction, like they agreed with her! My grandma and grandpa and the other aunt were sitting and listening to that shit.

I came home and told everything to my mom and sister and they felt really bad about this situation, We are being thoughtful for my aunt's family at every point and she has these thoughts about us......kya yeh unki 17 lakh ki akkad bol rahi h? How and Why people change when they suddenly have money?