> at least acknowledge that the norm has been shifting for a while now.

Sure. I agree it has been shifting, but mostly out of people simply not paying attention.

However, it's pretty easy to get it to switch. I have converted probably about 20% of my friends to doing cash tips simply by pointing out a single time that credit card tips have a significant chance of not making it to the server.

I haven't even pulled out the "credit card tips are a scam to increase the rake" angle, yet.