Stop backbiting and infighting. Stop tattling. Stop treating others with disrespect. Help those who need it without demeaning them.
Stop backbiting, tattling, and infighting. Try respecting your colleagues, especially if they're new to the organization. They don't need to prove themselves to you.
Literally everything. The culture is the worst part and it needs to be changed. You have the power to do this. Stop accepting tattling and back biting.