Yes, its an insult for people who think there's any value in the status quo, used often by progressives who think society needs to be radically altered because there's not sufficient equality of outcome between people
For example, someone who believes women get paid 77 cents on every dollar a man earns may call someone who does not believe this a "normie", since from that first person's perspective, the latter's ignorance is holding society back from a state where women will be paid 100 cents to every dollar a man earns.
Can you elaborate on how this can take place in the workplace?
I find it hard to believe a company posts a job and offers less salary to a woman as opposed to a man. Usually when a job is created the wage/salary is predetermined before the hiring process.
My understanding is that the wage gap is an average over time, which is due to women taking more time off work then men. Usually due to maternity leave, which is a totally normal reason to be away from work. The fathers tend to keep working because after all you need income flowing in constantly to keep the growing family going.