There are some people who think that the only halachically acceptable way to meet women is via a shadchan.
I'm not one of them.
I see nothing wrong with men and women socializing.
I'm not one of them either. That completely misses the point.
Because the point is that if you use shul to meet women, you should not act surprised that those who think there is a problem with men and women socializing are concerned about socializing in shul.