Your comment prompted me into imagining such a scenario. I found it almost impossible. Only a couple of days ago I witnessed a black woman board a train largely full of white men on their way to a rugby match (in one of the few areas of the UK where such a passenger is still a rarity): three of the men quite independently and invisibly to each other rose simultaneously to offer their seats. Gynocentrism and oikophobia are perhaps the true 'fragility'.