I am so enjoying this - but I think there are fewer of us! It's not new - 20 years ago at my DC's infant school there was a notice on the door with two spelling mistakes and one arithmetical one. Written by DC's teachers. I snuck in with a pen (am I allowed snuck?) and corrected them.
My other pet hate is (the often understandable) business of "it happened to my partner and I". Grrr. Fine if you're speaking patois and "is it I" is normal but not when you're affecting to speak basic English.
Have no problem with regional vocabulary, popular grammar. Round here we say somewhen instead of sometime. And I love the Scots outwith. Nor any problem with the creative use of language either.
But the other thing I hate is organisational speak. Who's for blue sky thinking, cascading, 360 degree thinking, out of the box and going forward? And when did SO become a way to start a sentence?
Ends rant. Drinks tea out of the box and cascades to bed.