This is why I'm glad I work from home, and rarely see people. I have family who don't live in the area so I see them only once every 6 weeks or so, and not 'in passing' when I am busy!
BUT I have a DH who tells me every detail of a programme he is watching/has watched, and I don't give a flying fook about it! I also get running commentary when he is watching some shit on the telly. Thank GOD for the internet, netflix, and headphones! I mean, he doesn't do it ALL the time, but maybe a couple of time a week! When he realises after 10 minutes that I am really not interested, he shuts up! 
Then there's this woman who walks her dog around our village. I go for a walk every day, and bump into her about once a week. She is pleasant enough, but when you bump into her, you KNOW you are in for a half hour of your life spent on inane chatter and drivel and bollocks and gossip about people you don't know. She is also incredibly nosey, and has asked me about 20 questions about my life, my job, my husband, where he works, my family, where I was born, my kids, blah blah blah.
I have walked 10 minutes walk out of my way, to avoid bumping into her.
There are a few others too (old colleagues of mine and DH's) who I avoid fervently because they talk for AGES. Me and DH see this one bloke he used to work with now and again (when we visit our old town 30 miles away,) and the last time, he and DH talked for an HOUR while I waited. I was soooooooooooo pissed off.
I did wander off a few times, but he was still there; as I said, for an HOUR.
I spotted this same man yesterday when we were in Tesco in that old town, and I ushered DH out of the shop quickly as I spotted him when we were at the checkout. This bloke was looking at the newspapers. Luckily they never spotted each other! 
I can't stand the bloke personally. He is misogynistic, racist, and bigoted, and very anti-woman. He is married, but is a twat to his wife, and calls her 'the hag.'
So OP, YANBU. I hate being a captive audience too. I don't understand why some people chat as much as they do about sod-all. Are they bored? Are they so clueless that they assume every person they meet wants to stop and talk for half an hour? 
I don't know, but grrr, it's annoying!