I have more of a problem walking into grocery stores, and having people in front of me stop dead in the doorway, instead of moving a few more feet in so they're not blocking the door while they bicker with their spouses about which way to go first.
I've never run into the OP's issue, but if I were paying attention I'd just move around them. In the grand scheme of things, it's not worth raising my blood pressure over. Besides, there are videos all over Youtube now of similar nudnicks walking into fountains, tripping and falling, etc., because they're not paying attention. Comic relief for me, bring it on!