I used to try and talk with people like that. Now, I revel in watching them swim in the bullcrap they spew. It never fails that sooner or later their true lack of knowledge will bite them in the butt. It's much more fun to watch them and less irritating.
My dad used to do that to me and my brother when we did really dumb things to our cars. Like spending good money on yellow ACCEL spark plug wires because we were POSITIVE that they would make our car faster. We learned a lot of good lessons swimming in our crap.