[torben-friis]

In my experience (not American, so your experience might vary) it's usually tied to toxic masculinity. Being the one who provides information, rather than the one who's corrected, has implications for some people in terms of ego and perceived social status, so they see a discussion as sort of a verbal fight for territory.

The same person would gladly accept the exact same information without an issue in any other context, provided that they had not just supported a different idea, but the moment they support one side they have to hold the fort.

In that context bringing up a Google search in the discussion feels to them like you're pulling out a gun in the middle of a fist fight. Sure it's effective, but the escalation is read as "I'm going to win this at all costs", rather as "I want to check the truth", and most importantly, you leave the other party no room whatsoever to save face, which is seen as an asshole move.