But @5128gap and @reigatecastle why do you want to sit next to me, a slim woman, rather than a man (slim or not), or a fat person of either sex or anyone else? We all choose but why would you choose to sit next to a slim woman who looks tame?
The interesting thing is @reigatecastle mentioning manspreaders. All women have experienced this but in what way is a man airing his balls and touching your leg with his that makes you wonder whether it is an accident or deliberate any different to a woman with a handbag. Why don't you say: "Move your legs, mate. I want to sit down."?
I'm all for safety but some people on this thread are boasting about being assertive. I'm assertive so why not do it and sit next to a potentially aggressive man or admit that sometimes you think it's wiser not to. That would be better and more honest than boasting about dumping handbags on the floor or even worse, intimidating people you perceive as weaker than you and bragging about enjoying it? Some people on this thread have done this. Why do that to some people and not to someone else?
Does anyone who insists on their preference to sit where they want (backwards or forwards facing) on public transport do this or do they just pick an easier seat next to a woman who looks like they are not going to argue?
I like public transport which is good because I have no option. It's usually in central London where I live. Other passengers or bus drivers or tube staff are generally okay and some people (including me on occasion) are astoundingly kind.
I would always move my bag if I didn't notice first or swap seats in the middle (no double facing seats on Tubes) so friends can chat or children can sit next to parents. I give directions; offer my seat and have pretended to know a woman who was being scared by a man to come by me.
That was because a woman did it for me 30 years ago and I thought I'd pay it back. It's a brilliant idea because no one is threatened but everyone is embarrassed by the intervention of a middle-aged woman in a public space. It is our superpower. In that small but important way we are more powerful than men.
I'd always welcome a vulnerable person of whatever age or sex to sit next to me on public transport if I thought they were threatened and needed my help.
But I don't like aggression. I don't understand people who boast about claiming their rights which boil down to intimidating someone they don't think can stand up to them.
I am assertive but also defensive and even submissive on occasion. I've learned it makes sense. I am never aggressive and though I don't seek confrontation I will not avoid it.
It's easier to negotiate and not show off.
So if anyone wants to explain why their approach works better than mine then sit by me and chat. To show willing I'd even welcome people like @ReneBumsWombats who whine: "Oh but you've changed your position."
I haven't. I explained other situations as asked but my position remains sound - you don't give up your space for other people unless there is a good reason and there are no other seats available.
TL:DR I'm not moving my bag if there are other seats available.