VGC Rule: Why is the word Biased allowed but Fanboy isnt?

[MDMAlliance]

I imagine if you think about it hard enough, you'll realize that the reason why "biased" is allowed but "fanboy" isn't is because of connotation.

The word "bias" has a relatively neutral connotation. The word "fanboy" is quite negative and makes more assumptions than the word "bias" does.