As a followup to Does stackexchange have any standard for sources? and Why do we need references?, and inspired by several answers I've seen that have been downvoted due to citing conspiracy-theory-quality sources only to have those downvoters accused of bias/suppression, I'd like to propose that we set some concrete minimum level of standard for acceptable sources, for when sources are provided.
As a starting point, I suggest that we prohibit using any sources from Media Bias Fact Check's "Conspiracy-Pseudoscience", "Questionable Sources", or "Satire" categories.
Answers based on these sources can get a "poor quality source" banner similar to the "unsourced" one we have, or the latter can be modified to be "unsourced or uses untrustworthy sources". Alternatively, they could potentially just be deleted as very low-quality if they rely solely on this type of source.
My hope is that by providing a specific list and a policy that can be pointed to, there will be less back-and-forth over this type of answer, and we will be more consistent about what gets jumped all over and what skates by.