The numbers show that 80% of the girls only date the top 20% of the guys. They rate 80% of the guys below average. So an average boy find hard to find a date there. Think this way, before you could have a few opportunities to get a date in a bar, now you have thousands of them before even getting out of the toilet. You think your value is higher than it really is and decide to wait for something that has he same value of you. As this is not possible you end up waiting more for sex. In small towns pre-internet there were more relationships than in cities as they know the pool of candidates is small and fixed. If they waited for the perfect one they would have wait forever.

I think the parent is suggesting that there is the same or more sex, just for fewer people. If you can access a thousand people in your league there is no reason to look outside of it (we're all min-maxing) whereas before you were limited by vicinity.

I understand tinder has become more of a dating app than a quick hook up one these days anyway. At least that's what friends tell me, I prefer getting drunk in a bar the old fashioned way.