On my commute in this morning, there is a woman sat behind me swearing and complaining to herself loudly enough that I can hear it without trying, about a multitude of things; her phone, the train, being late amongst other things. Since when has it become acceptable to subject everyone else to bad language and your frustration in public places?
YABU - She’s having a bad morning, leave her alone.
YANBU - Standards of behaviour in public have declined. Inflicting your bad morning on everyone else isn’t ok.