When you go against a social norm you have to set expectations early on. Ideally before you even go on a dinner date. None of the women I know have a problem going Dutch; all of them would be really offended if you took them to a fancy restaurant and then when the bill came you expected them to pay half. You have essentially tricked them.

Here is a hint: If you want to go Dutch then take a girl for coffee or on a picnic ("you bring the bread and dips, I'll bring the drinks and cheese" etc) at least until you get to know her better.

Perhaps to you $80 is nothing. In my early 20's it would have been 8 hours work. Why would I spend a days hard work to have dinner with you when I can have dinner with another guy, who has just as much chance of being a great guy, without the expense?