Just looked out of the window to see my neighbour from two doors down painting my front garden wall! AIBU to think this is really weird? (Albeit probably done with the best of intentions...)
I live in a terraced Victorian house with a white painted front garden wall at the front. For what it's worth, I take care of the appearance of my house at the front with window boxes and plant pots, get windows cleaned, and had the wall and my window sills etc. re-painted 3 years ago so they are not exactly looking terrible. The paint has worn down a bit in the rain and London pollution but compared to some houses on the street was looking just fine.
This neighbour is generally obsessed with the appearance of our bit of the street - often sweeping the pavement, putting everyone's bins back into front gardens etc.
But surely you knock first before starting to paint a wall that doesn't belong to you?!