VLC's subtitles are terrible to work with for subbers, and really ugly for viewers.
Also it tends to lag and crash every so often...
Also some subbers have intentionally put subs out there that they know wont work well with VLC (IE, XBOX HUEG SUBTITLES or random gibberish) in an effort to further fuel the fire.
Either way, there are better alternatives to VLC now anyway.
Some people still use it for some media file formats every so often.
And then theres also some people who go out of their way to tell the world how horrible they think VLC is, probably just because they're elitist pricks. (In much the same way Mac fan boys are against Microsoft)