And capsaicin doesn't need to be eaten in the mouth to have a spicy feeling.
As long as capsaicin touches the surface of human body, it will produce a burning sensation.
The landlord feels that what you said may be that the concentration of capsaicin in pepper was relatively high that day, and of course the eyes themselves were sensitive. That's why I feel uncomfortable with my eyes burning.
But try to close your eyes for a few minutes and then open them again. When some tears come out, you will feel much better. After being stimulated, the lacrimal gland will naturally secrete tears to protect the eyes.
I hope it helps you.