Yeah it’s a euphemism and a bit of a shibboleth, which, like all shibboleths, can be a bit triggering to those who feel outgrouped by it.

I could’ve been more precise: “opinions that are based on weak evidence that confirm a certain preimagined view of the world rather than challenge it”.

I mean they made claims about the efficacy and risks of the COVID vaccine without sourcing them and used verbiage like "poisoning our children" to refer to vaccinating them. I think tip of the iceberg for "problematic opinions" is a fair response.