even if it is just where he chose to sit i'll stick with them both being twatty.The background is that 4chan decided to troll the media by putting out fake info that the OK sign was a secret nazi sign for white power because the hand sign creates the letters WP. It was a joke that they all fell for, so now they are convinced that it is a white power symbol but also white nationalists have started using it to troll people too.
It could be one of 2 things, a white nationalist trying to intimidate her using an OK handsign they co-opted from a 4 chan troll or a random guy who is not even thinking about the woman and happened to sit across from her and is unaware of the situation.
Seems obvious he never actually spoke to her or interacted with her prior to or after this photo, so she is making an assumption and posting this guys photograph which she secretly took for all the world to see and labeling him a nazi simply because of his hand positioning and skin colour.
If some white woman took a secret photo of two black guys that sat across from her on a bus, one wearing something red and posted "OMG, literally shaking RN, this Blood gang member just sat across from me and tried to intimidate me. I thought they were going to rape me or something", it would be pointed out to her that she was being a wee tad racist and alarmist.