Is English language sexist?

Woman and men face double standards, and we're not just talking about the gender pay gap.

Sexism in the English language Source: The Economist

Have you ever thought about why we use such different words to describe men and women?

A dominant male in the workplace can be described as assertive while a woman with the same characteristics could be called bossy.

Unlike practically any other European language, English doesn't have a lot of gender inherent words but some of our words have become gendered anyway. Think about the word feisty - have you ever heard a man described that way? 

Do we need to be more careful about the words we use and how we use them?