Women's day 2017—blame the process not the person they say

Women's day is a month away. If you're a twitter person you might have seen this last year:

If you haven't, do read the whole thread. Here's the link.

In short, Martin and Nicole are co-workers. Nicole's boss always had a complaint against her that she took too long to work with clients. Both of them do a small experiment where Martin signs emails as Nicole, and vice versa for a week. And Martin realizes that clients became more difficult when he signed as Nicole.

Now, consider things from the manager's perspective: he thinks Nicole isn't as productive as Martin because she ends up spending a lot of time with each client. If he has to lay one of them off, who would it be?