Don't think that's a fair comment. The fact that there was hardly any mention (at least I didn't come across any) of that back pass on the forum is proof that most of our fans aren't that fickle. Let's not forget, we have had some clowns play for us in the CB position and they have never been booed.
The only thing that worries about the situation with Holding is that he is being hyped up so much by the Arsenal fans and some pundits that it might affect the way he thinks and plays. A bit like what happened with John Stones. I just hope he can keep his feet on the ground and realise that he has a heck of a long way to go and that key to being the best in the world is consistency.