Not sure Scotland has many gaelic speakers, maybe on the Western Isles. Anyway, the DUP line is just the remnants of not wanting catholics about the place, I've no problem with the heat being turned on them.
I'm not sure where everyone else is encountering all these cultural warriors, striking them down with their rabid Irishness. TG4 means RTE doesnt seem to do as much of the gaeilge tokenism as in the past. TG4 is fairly accessible (as much as it can be), usually subtitles etc.
I think, a bit like the GAA haters that emerge from time to time, there seems to be a dark memory of a Christian Brother or a coach who was a villain, and that colours the whole thing forevermore. There isn't much to hate about Irish, maybe it could've been taught better, maybe you'd prefer not a cent to be spent on it, but as a language it is not the enemy of anyone. Irish language, sport & music are things that make us distinctive & are worth preserving.