They were 1-16 from three point range. I don't know how much worse you have to be to qualify as "historically bad". Again, I haven't said that the Spurs should have abandoned three point shots altogether, but when you take that many, it's a near-certainty that many of them are poor shot selection, and mixing in a few twos just to get the ball going through the hoop is a good idea.
Someone talked about the Spurs putting up so many points on Minnesota, when in truth it took overtime for them to get to their average against a really bad team.