As I understand it, if someone sues you because they ate your food and got sick or injured because it was too hot, you're probably going to be fine if you can show that you routinely eat food that hot, and there's no evidence that you did it as a trap. My understanding is that, even if you eat food that spicy, if you tell someone "Someone's been stealing my food - they're going to get a big surprise when they find out how spicy it is today," you might have an issue. I'm not a lawyer, but workplace food stealing and resulting traps are apparently fairly common.

I’ve seen stories about this. If it’s so hot it makes someone else ill, but you can eat it, you’re fine. If you maliciously make it too hot for anyone, that’s apparently unacceptable.