You can always tell a "wiccatru" poster on an asatru mailing list or discussion group, because that person is always the one who just doesn't seem to totally grasp the concept.
You don't have to form a kindred in order to be Asatru. You don't even have to be in a kindred, if there isn't one near you. The Gods don't care if you're in a group or by yourself, they'll listen to you all the same. But bringing a wiccan god or goddess into what is supposed to be a heathen setting or trying to mix Paganism and Heathenism is a pretty good way to get a heathen to look at you and say "Uhhh...you don't quite understand this, do you?"
Pagans tend to get really upset when you comment on it, too. Why? Part of the search for truth in one's life includes a hard examination of things, doesn't it? At least, it should. That's how I wound up becoming heathen, after a long and twisting spiritual journey that included forays into two "mainstream" religions.
I just don't get it.