That seems to have an implied "... so every time I argue with a human, I should never assume that the human has more than one reason for something".
Absolute claims are almost never correct. Replace the "never" in your statement with "usually not, especially when discussing politically charged, or better yet, weird-sounding topics" and you've got yourself a deal.
You're refusing to address someone's stated argument, and in fact, are saying something that is nonresponsive if he means what he is actually saying.
Yes, sometimes you have to do that. But making it your default behavior when addressing all people in the real world who don't agree with you is a bad idea.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one. (Immediately before; refresh the list-of-threads page before posting.)
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.