The other day I called a company about a job they advertised that I was interested in. I spoke to the HR manager there who asked me what kind of relevant industry experience I had. I told him I was very proficient in XYZ. He then proceeded to say something negative and factually incorrect about XYZ, followed by blaming unrelated product problems on it before finally claiming that one should develop their own tool instead of relying on XYZ.
Assuming I was applying for a construction worker job, he said something like: "It's easy to tell if someone used a Stanley brand hammer to build a house because it results in poor construction. You shouldn't use a Stanley brand hammer because it results in poor-quality construction. You should make your own hammer."
I really wanted to correct him and explain how he was wrong, but wasn't sure if it would be the right step to take seeing how he's the one who will decide whether I make it into the company or not and at the same time, if I get hired, I wouldn't be interacting with him very much anyway.
In the end, he sent me a test and if I pass it, I'll be seeing him for an interview. If it comes to that, should I correct him then? Or should I send him a follow-up email before then to explain things better to him?