It did seem to break a bit easier than I'd expect.
But, it didn't help when you put the heel of your left hand up on the mid-length of the rod. It turned that point into a fulcrum.
The only analogy I can think of is how one might break a large branch or stick by bending it across your flexed knee to snap it. Instead of the pressure coming from one end, it suddenly gets doubled and focused on the fulcrum . . . from two levered ends. You inadvertently loaded up two pressures on the rod in a very concentrated area. Pop.
Still, I'm either a bit unimpressed with the rod, or super-impressed by your physical strength!