Yes, because you can typically judge if they're smart;
If their avatar is low-res in a stuffty format, they're stupid.
If their avatar is a lolcat, they're stupid.
If their avatar is COME TO THE DARK SIDE WE HAVE COOKIES or something like that, that is generally unfunny, they're stupid.
If their avatar is clean, stylish, and in a good format, they are a fine gentlemen.