I've just noticed that for some reason the Apple.SE site's meta is considered a separate site for the purposes of chat:
Given it is the only local-meta that gets this treatment, is this correct, or something that should be fixed?
The drop-down is influenced in part by what exists. Since there is an apple-meta room, it appears. In the general case, it would be more correct for that room to be aimed at apple.stackexchange.com; I am unclear why that room invented itself - I will check, but it was 6 months ago, so it might have been a long-resolved bug.
Since this room is vacant, I'll delete it (in addition to changing it to apple.stackexchange.com, just in case ;p)