"Just compare them - have a look for yourself," Colin Barnett replied when asked if the Liberal Party should adopt a quota system to increase the number of female MPs.

Sue Ellery, the leader of the opposition in the Legislative Council, on Monday tweeted "How not to get more women in parl't - denigrate the ones already elected" with the the hashtag #mediocremeningreysuits in a bid to hit back at the Premier.

"The Premier didn't engage his brain before he opened his mouth," she told Fairfax Media.

"The first thing I would say is you're not going to get more women into parliament by denigrating the ones who have already been elected."

Ms Ellery also called on the Premier to elaborate on his critique of WA Labor women.