MyChild I did the same. Always offered to pay half, but was always a little impressed if they didn't let me. I did always insist on getting drinks or something (to judge their response as much as anything). I only once felt like I was being treated like The Little Lady so perhaps that's the difference.
I think it's the difference between someone paying because they've asked you out and and it's their treat, and someone paying for you because they'e The Man and it's what Men do.
With the man I mentioned above, when we went to the cinema we'd unintentionally gone on the cheap night so he only paid £5 or £6 for the tickets. When we went to buy the drinks and popcorn, he made a big show in front of everyone about how if it came to more than the tickets then he'd have to give me the difference because he couldn't let a woman pay more than him.
That was shortly before he 'told me off'...
I was also a bit
at one date I went on where we'd gone for a drink and a pub lunch. We'd paid for our drinks at the bar, so they didn't go on the bill and he suggested we went halves on the bill which came to just over £13. That was just embarrassing!
But most of the men it was never an issue with.