There are now conflicting reports as to whether it actually happened or not. I believe it happened.
It sounds less like a group of fans and more like one or two.
I can see it as someone finding out Schaub's address, going there to take some pictures, Schaub (or a family member) confronting them to get them to leave, and the fan talking trash at that point. Fits most of what we've been told, and easy to blow out of proportion.