“It’s just a theory” is the most irritating and ignorant argument made by science deniers, but you can’t correct them without sounding like a pedantic asshole.

That’s one thing (of many) that really annoyed me about MatPat’s “theory” channels is he used that as a slogan. He’s hailed as this great YouTube educator yet continued to happily perpetuate the misconception that “theory” is synonymous with “tenuously connected set of ideas formed from 3 hours of Googling stuff in your underwear”.