First, as Americans we only know about winners. Second, the running community is very small. By that, I mean, people who run, compete and are aware of what a fast time is for a 5k, 10k, etc.
I can only assume you talked to either a female who is a jogger, mid pack runner, or non-runner and does not care. Most non-runner friends have no idea about a time. Some of my friends who don't run call 5k's "5k marathons".
To win a local 5k in 19 minutes would impress them more than if you came in 2nd in 14:40.
I can only assume I'm older than you, so here is what I can tell you about women; They are in many ways, no different than men. Most judge a man by the following: looks, build, success, material items.
Example: Mick Jagger of the Rolling Stones comes to your house. Except, he is not a famous rock star. He is the repair man for your oven. Is he hot now?
Life is not fair. The better looking people get better treatment. It's just the way it is. Look at the hot girl who turns heads. She knows it. How could she not?
Not only do the better looking get treated better, but so does the guy in the expensive car, with an expensive suit. Perfect example; I went to pick up my wife at work while in my shorts and t-shirt. Many female employees there. No one took a second glance. Weeks later, I was picking her up after I had a meeting and had on a suit. I was treated better.
Does any average person know who came in second in the Olympics in the marathon, decathlon, etc. No. nor do they care.
so, after this long-winded rant, the reason women are not impressed with your 2:50 marathon, is because that is not something they really know or care about.
Try accidently letting them know you have a summer home somewhere and that you are a lawyer or successful business man. Watch the treatment change.
Not all women, but many.