"Perception, perception, perception, the trick the WTS uses often to guilt jws into not doing something that has no real scriptural basis. So it is not a blanket belief officially but it can up being that way unofficially."
1 Thessalonians 5:22 King James Version
"Abstain from all appearance of evil."
Because of its wording, the KJV version of the above verse was used as a blanket prohibition against pretty much anything in a former church of mine. The mere "appearance", whether ACTUALLY evil or not was enough to condemn a lot of actions by youth in our church. It was usually couched in references to how people outside the church (in the world) might wrongly perceive said actions. That's the "appearance" part. Most modern translations render it as every kind or all forms of evil, not the mere appearance of such.