Ken MacLeod writes about why the use of Gaelic in signs in parts of Scotland bugs him. It's an interesting, if brief, look at the emotional entanglement with language that, for most of us, usually remains buried.
The comments are also worth a read.
But for what it's worth, my guess is this: we regret not speaking Gaelic, and we resent the presumption that we should.
The comments are also worth a read.