I haven't ever seen that myself, but if it is so ubiquitous where you are, I'd argue that walking out is anything but pointless, and that in fact it has become

I haven't ever seen that myself, but if it is so ubiquitous where you are, I'd argue that walking out is anything but pointless, and that in fact it has become necessary. Companies will abuse us to whatever extent we allow them to. Stop enabling them and their behavior. As long as you are capable of finding food somewhere else, you should do exactly that. If you don't exercise that option now, you may lose it entirely.