I like to judge favorable wherever possible, but in this instance, the conclusion I draw is that “yeshiva guy” is uncomfortable by the davening done by these girls. Perhaps it bothers him that a girl is davening and he is reading the times. Perhaps it bothers him that she is davening and he is staring at the walls. Perhaps it bothers him that she is davening slowly despite the place she finds herself and he mumbles through davening in a comfortable shul.
Whatever is bothering “yeshiva guy”, perhaps he might be best served to stick his nose into a sefer and not worry about what the girls are doing 🙂