Sounds a bit like a stick-in-the-mud, to me. Not all Christians think along these lines. I see no problem with another woman dressed neatly in modest pants. In fact, there are a great many women in my own church (it is fairly large) that I have rarely seen in a dress, and some I have never seen in a dress at all. It all depends on personal conviction.
As for me, I choose to wear dresses or skirts to church service. However, the rest of the time, I'm strictly pants! Don't like it? Tough!