I'm going to walk on the wrong side of the footpath
Why would you walk on the wrong side?
Because I felt like it.
That's fine, I understand. But change to the right side if anyone is coming towards you.
It's not my problem if they are walking on the wrong side and should pay attention.
Well you'd be walking on the wrong side in that situation. That being said, I think it's fine to walk on either side as long as you aren't in anyone's way.