is it reasonable to assume an FTL civilization to be so dumb to mistake a spacescraft for a rock?

I don’t know if ours is an FTL civ or not, but I do think a large number of us are mistaking our own spaceship[0] for a rock.

[0] https://en.m.wikipedia.org/wiki/Spaceship_Earth

We have aircraft today that other nationstates are "so dumb" to assume is maybe a flying ping pong ball based on radar signature, not a delta wing full of thousands of pounds of bombs.