I'm talking friends or long-term acquintances, with whom you don't meet often but keep in touch, and then you meet to catch up. I came across this twice recently, one a closer friend.
I'd think it's polite and shows that you care about the person when they start some subject which may not be riverting but something relevant to their life right now, and they want to share a little. Obviously I wouldn't bang on about myself for long, and I ALWAYS listen and respond for a good while when it's a friend talikng about their hobby or domestic chores or whatever - I ask a few questions and I do want to know to an extent.Then IF it goes on too long I try to steer to a different subject - and it's fine by me if they do the same.
But when I start to talk (and not plan to bang on) about something boring but relevant to my life, literally in a few seconds - that eyes glazed look. I obviously stop. So am I too sensitive - and is it fine to show immediately you are not interested and I should do the same?