How do you even know the person you're replying to is of a different generation? I'm no millennial, but I've frequently not been able to leave a tip while payi

How do you even know the person you're replying to is of a different generation? I'm no millennial, but I've frequently not been able to leave a tip while paying for dinner in the UK because I've paid by card and had literally no cash on me. I've felt bad about not leaving a tip for good service, but I know that the servers will at lease make minimum wage before tips, unlike in the US. The whole point of this entire thread of discussion is about how people are switching to card-only payments in some areas and different/changing cultural norms, and while there could have been an interesting discussion about how this impacts other cultural norms like tipping, you instead just call someone an asshole like Grandpa Simpson yelling at a cloud.