Toxic sibling

I have a toxic sibling who thinks they are always the victim it’s exhausting tbh. Every-time they make it seem like their childhood was hard compared to mine like they got everything from our parents and they were spoilt I wish I had half of what they got but they are still so ungrateful I don’t get it. Like I am grateful for what I have and I do the best with what I can but they always say mean stuff about others it gives projection or being a bully.

They always make statements about my body or someone else’s body in a negative way and I feel like I don’t know what to do in regard to this situation cause it’s so much for me. Any advice would be needed.

TLDR - toxic sibling creating unhealthy environment for those around her.