Short answer.

Long answer: What you seem to describe is not scientific illiteracy. It's called running's one mouth or bullshitting. While that's also not very pleasant, there can be multiple reasons.

What I consider to be scientific illiteracy is not understanding the more simple things: the water cycle, evolution, Newton's three laws of motion, the basics of radiation, basic chemistry. Stuff we were supposed to have learnt in high school (but that people didn't because of a poor curriculum, religion or X other reason). And due to how quickly and powerfully science is changing our world, I find it to be completely unacceptable to have no basis in science and mathematics whatsoever today. It is even more unacceptable if it is wilful - because of laze, beliefs or otherwise. And a LOT of accidents/events could be avoided with these - less chemical-related deaths, most people would most likely drive a lot more carefully, and they might not picket nuclear reactors under the basis of "OMG RADIATION". They might care more about the impact of our industries.