I'm not a guy, but I was thinking of this today. I get bored when people give every tedious detail - especially mundane things. I prefer to hear the brief overview and any unusual or funny tidbits, not "And then I ate supper. It was chicken and broccoli. And then I watched tv and folded the laundry. I need to buy more detergent. And then..."
I find both men and women are guilty of this, so I don't know if it's one of those "red flags" like bashing your ex, but I find it difficult to stay engaged.
Well, this question is directed at guys, but open to girls too so I'll share my answer. :) When I am talking to another woman I find it very difficult to pay attention when they start talking about home decorating, clothes or... ughhh jewelry. I even had a friend who would invite us to stay the night at her house and then watch the jewelry channel while we were laying in our sleeping bags. So boring! We were only like 8!