Earlier quoted context omitted.
"This necessitated aiming New Horizons at a "keyhole" in space just 100km by 150km (60miles by 90 miles), and arriving at that location within a set margin of 100 seconds." That's pretty damned impressive by any standard you care to mention so go ahead, "U-S-A" yourselves a few more times. I think it was earned.
You do not seem to have understood his / her remark. He / she was not trying to diminish the remarkable achievement nor questioning the celebration of this success. But the jingoistic way it was celebrated. EDIT: Why do I get downvoted? I was merely explaining OP's point of view.
I don't see the bias here--New Horizons is legitimately a project to be proud of.
On the other hand, it's arguably pretty aggressive to accelerate a machine to over 13 km/s and send it inside the orbit of a planet's closest satellite.
On the gripping hand, Pluto's government hasn't complained, so why should you?