Truth involves a belief system. Fact is quite different. A fact is indisputable. 1+1=2. There isn't room for argument. Except for the wild and wacky world of audio.
Example: at a "serious" listening session, we were testing two different interconnects. The RCA connectors were identical, and were of good quality. The wire was a nice microphone cable and also identical except for color. The audience wasn't informed of this. We let them switch cables back and forth for an hour. For the record, blue sounds much better than green. Some people said they couldn't hear any difference. Others came up with every possible descriptive audio term imaginable. We let these people, drive, vote, and reproduce. When the volume was up too high, and the amp was clipping, they didn't notice, but they can hear the difference between colors. Go figure.