I can talk for hours with anyone about anything, but I have some kind of social anxiety about starting the conversation, and that sadly goes not just for strangers but also for people I'm familiar with but not super familiar... I'd never start talking to a person sitting next to me on a train or a plane, but when they start I'm most often very glad to have someone to talk to...
I hope i will run into you. I like starting conversations. I tend to hate it when people slow down or block the conversation by simply replying with a short yes or no, even when there's nothing for them to do (while, say, waiting in a queue) other than gazing at their little screen.
I hate to do that but it often happens. I'm not sure why, but I wanted to share that it can be incompetence to keep it up rather than being not interested.