Why do people hate Papyrus? ;o; /used it once for a sig. and had people telling me to change it to Comic Sans, which was better, but still... (also the text was image-form, just so no one calls this out as a contradiction to Touko's post)
Anyways...
So, what are the things you hate so much you'll never use it as your avatar or signature?
You could not, in a million years, get me to have blinding/very out-of-place text (in terms of colors or text or w/e) and terrible quality images. I'm very picky when it comes to fanart, and even pickier when it comes to what fanart to display in my themes (typically; I'm a bit less picky about this when it comes to avvies). I would also never put any American-originated songs (unless it's BGM) or lyrics in my sig. The only exception would probably be the original Pokemon theme and (unless they did originate in Japan) the songs from Sonic Adventure (particularly Open Your Heart, Believe in Yourself, and It Doesn't Matter)... OK, let me rephrase this. I would never put any American-originated songs in my sig. unless it was BGM or from an anime or video game.
What if anyone dared you to use those images in your avatar or signature?
I'd do it for a day, but then I'd go back to what I originally had. Unless it was breaking the signature rules, in which case I'd flat out refuse (don't want to get in trouble with that, now do I?). Although...with the American music, I think I'd never put it in regardless.
Why do you hate this/that thing?
...I think it should be fairly obvious to most people why I'd hate putting in LQ images and gross text. As for the American music, I just think most of it's stupid nowadays and can't really see why the hell it's so popular. Call me a "weeaboo" or w/e (except that I am willing to put in Swedish and classical music; that stuff rocks) but I'm just not a fan of American music.