I've no doubt this was raised before but I've not seen it.

The two nightclubs in our town switch up the lights and play this at the end of the night. For as long as I've been going there it's always done.
And people stand quietly and cast dirty looks at the few people still chatting.
This is the midlands, not some border town.
Plenty of pubs do too but not all.
As for weddings in the local hotel when I was barman, maybe 50% do it.
But being in Galway, Limerick or Dublin it doesn't tend to be played at the end of the night.
Is this a rural tradition so? Does it go on in your local area?