I'd rather hear any reason than nothing at all. Even if I can tell you're lying. Even if you scream at me and ragequit.

A legitimate reason is totally forgivable. An obvious lie might be amusing, and at worst, is forgettable. Screaming is definitely forgettable (I promise not to give a crap about your opinion for longer than two minutes, so no harm done <3).

Regardless, at least if you say something, I know I'm not being a d-bag queueing for a replacement immediately instead of waiting to see if you just got DCed.