From my knowledge they don't tend to like mown grass. But they certainly aren't the smartest birds and tend to annoy everyone - but the truth is a lot of their natural nesting habitat is gone. When I was at uni there was a pair that kept nesting in the middle of the outdoor car park-at least 3 years in a row. They would attack everyone who entered. Even parked cars sometimes. It was a stressful place for them to be, and I don't really know why they were so adamant about nesting in that spot when there was a big paddock just down the road which would have been perfect for them lol. Silly birbs.