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I used to have a friend that I'd always have to pick up when we would hang out at my place (they didn't have a car). Either I'd pick them up or a mutual friend would who was also hanging out that day. We both had the same routine for the guy without a car.
We'd text them 30 minutes before we left saying we were leaving in 30 minutes, text them when we left (which was a 20 minute drive), and then we'd text them when we got there. They'd not be ready for 30 minutes or more a lot of the time. Eventually we told them that if we wait 10 minutes we're leaving without them and not hanging out that day.
The first time I left without them I got a text an hour and a half later from them saying that they just came out and wanted to know where I parked. Literally 90 fucking minutes after I left they messaged me. The text that they sent me when I got there was "Awesome! Be right out." And they expected me to wait 90 fucking minutes for them after that.
We left without them over a dozen times (not consecutively) before we stopped hanging out with them for different but related reasons. A complete lack of mutual respect and a complete lack of respect from them towards others.
I haven't spoken to them in years and it still makes my blood boil at times thinking about them.