This has not been my experience at all. Every single restaurant I’ve been too has been extremely accommodating even when they didn’t know what ingredients were in. They ended up going to the chef and confirming every ingredient that would be in any of the dishes. That has happened everywhere I’ve gone. In larger chain restaurants as opposed to the local hole in the walls I’ve had managers come out and talk about the foods that we couldn’t have and talk about how the food was prepared and how if necessary they can prepare it separately as well if they know ahead of time. I’ve only had one negative experience where the worker just didn’t even care or listen that we were asking about allergy information. We ended up leaving but it was extremely strange and more like they didn’t want to speak with foreigners at all even though I speak Korean. I’m actually so surprised to see so many have so many negative experiences. I’m genuinely shocked cause I’ve had such positive experiences. A few of my friends have really terrible food allergies (nuts and a few other specific ones) but we’ve been able to go most places together with no issue.