I was working at a healthcare company made up of about 90% women.
The first team I was on, one of my female coworkers befriended me and would talk to me and go back to my boss (also female) and tell her my business and twist the truth about my work.
I moved on to another department in the same company and the catty women were way worse. They would steal my ideas, come near me and whisper things and snicker among each other. They worked hard to destroy my character in the company.