I get the annoyance, but telling us (with a small, probably insignificant chance of "us" including this guy) won't change that shit. Use your words and ask him to move the bag, even if you're asking for some other fuck who won't say it.
^I agree with the other posts. OP is not necessarily wrong, but instead of complaining on an anonymous blog, it's much better to simply ask the person to move their bag. All of this nonsense about lack of courtesy is just total bullshit. I'd rather be a supposed dickhead than too afraid or bashful to ask someone on a bus to make room for me to sit down. It's a sign of the times that we all post status updates and tweets, and click "like" and text, but god forbid we have real fucking interactions.
The point of the post is to raise awareness of the lack of public manors people have today. The possibility that she may or may not have asked the person to remove their bag is not mentioned in the post but it doesn't mean it didn't happen. The fact that your assuming she didn't makes you illogical. She may have only posted this way to express her disapproval of this behaviour with a slight tone or humour. In short chill the fuck out people and remember your manors