I'd call this anything but whataboutism.

The China's example is there because it puts the threat mentioned in the title into a perspective.

We definitely shouldn't destroy any satellites, but we already did. I don't see a reason not to compare them when we discuss how big is the threat.

EDIT: to those who downvote this comment, I'd love an explanation why you think I shouldn't make this comparison. As far as I know, no country destroyed more than one, so how else am I supposed to compare them?