I would be fully prepared even expect to pay my own way. It's important to me to start the way I expect to go on.
If he insisted on paying, I would thank him and agree to take it in turns to pick the venue and to pay in future. It actually works quite well if the person who is paying gets to chose the venue do they know what they are letting themselves in for.
If he did not go along with that, I would know that he is not the right one for me.
Anyone who feels that it is 'man-ly' for him to pick up the tab may also think that the important decisions in life are for him to take and my role would be to have his food ready when he got home. That might have worked for my mother's generation, I expect more.
I don't need to ask for more, I have the choices that are important to me.
For me, being treated 'well' means having equal access to resources and choices, getting what I choose not what someone decides is good for me.
For the record, I much prefer an aisle seat to a window seat. Why DH and I fly (flew) short haul together, we would each have the aisle seat in the same row.