If all else fails some people even resort to supernatural explanations like karma. I’ve seen this with illness, like when someone has a disease that they didn’t cause themselves in any way such as cancer or an autoimmune disease. Somebody told me that I must have “been really bad in a past life” to be chronically ill. It’s like they’re unable to accept that some people are unlucky so they really want it to be the victim’s fault somehow.

With something like celiac, people suggest you have it because you’re misinformed and believe it exists, or they invent reasons that they think you caused it for yourself. Same with type 1 diabetes, another condition for which the cause is entirely unknown other than genetics. People also like to downplay severity, without considering that it varies, and say things like “I know someone with that” (which may or may not be accurate) “and they don’t have such a problem with it”.