“If the girls learn the same halacha, they won’t consider it rude.”
If the gentleman acts in a consistent manner, they won’t consider it rude.
Many “girls” learn the same halacha & stand behind to let the men on the bus first before going down the bus aisle to the back. However, there are men who will not grant her enough space to pass through the aisle despite “excuse me”s, making it seemingly ok for a brief contact with her.
You men here in the CR sound like the consistent ones, but there are those who are not doing it for the proper reasons.