We don’t. Although most of my friends do not keep kosher, many still won’t eat meat mixed with dairy or pork - bacon excepted. I think it’s from their childhood dinner table memories. And when you think about it dairy and meat is sort of yucky...although often delicious.
Isn’t the rule about not mixing dairy and meat based on the biblical prohibition against cooking a baby calf in its own mother’s milk? That was apparently a popular delicacy in the ancient Levant, maybe especially among the hated Philistines. I remember being puzzled when I came down for breakfast in the restaurant in the Tel Aviv hotel I stayed at my first visit to Israel. I had to choose meat or dairy rooms and buffets, and no going back and forth. And what is it with the unspoken exemption for Chinese food? The kitchen walls in most Chinese restaurants are coated with a veneer of steamed pork fat.