You could have said "remote SC" or just "SC". I realize it's less colorful, but experience teaches that this is a price we must pay to have civil discussion online.

Had we been speaking in person it would likely have been obvious that you didn't mean it as a slur. But the bandwidth of online communication is so much lower that there's no capacity for such error correction even in one-to-one cases, let alone when hundreds of people are reading what you write.