Let’s get something clear here.
Men sitting with knees three feet apart on crowded public transportation, in a full auditorium, or somewhere else that other people might need to sit next to them = manspreading
Men sitting with knees three feet apart in a 90% empty bus, a chair not connected to other seats, or any other setting where they’re not encroaching on others’ seating options or personal space = whatever, people can sit how they like