I should have written One of the issues is that labels can take on permanence
Some people can’t, don’t, or won’t reconsider their labels once they have applied them
Basically my premise is “People change” 
People do this all the time in different ways.
There’s never been a person whom you thought little of that you simply discounted their opinion because you thought lowly of them ?
Or advice on a forum that was dismissed because “oh he’s just a beginner. What does he know ?”
Labels come in all shapes & sizes