I don't think anyone is saying otherwise. The difference is the volume of that stuff. You almost never really see that about Kirby unless you really go out of your way to find it. Unlike Sonic, where it's right in your face when you least expect it.Guys, EVERY fandom has OC's and creepy fanart. There are no exceptions on the Internet, none at all. For every Sonic recolor, there is a Mario one. Just like there's a Mary Sue with a 2edgy4me stereotype that the cool kids would love. So Kirby does have its flaws, but arguably less than the Pokemon fandom.
*shudders about the many bad Pokefics I've read*