This is toxic femininity as a political weapon. Shaming. Shunning dissidents. Shutting people down by nagging them or organizing groups to exclude them. Constant nagging to do this and that, never letting up, because they say it is for your own good.
The funny part is that Europe is awash in budget airlines. It’s much cheaper to fly within Europe than taking the train across the continent in most cases. Airline travel is quite popular in Europe.
Most Europeans are going to tell the shamers to shove it where the sun don’t shine.