We have a PM who is filmed responding to a protester in front of dozens of press and TV cameras at an event with "there's no press here", while hearing constant shutter clicks audible in the background. That he's completely tone deaf dealing with the EU, our neighbours or electorate shouldn't be the least bit surprising.
That said, since Irish independence there has been a good degree of desired closeness between the two countries, not least the passport free freedom of movement and voting, which survived the worst of the NI violence. Looking back that can seem surprising. Record numbers of Brits have been applying for Irish passports (a remarkably high number are eligible) since the Brexit vote.