well, personality more than anything. One of them is just a very bitchy jealous person, and the other one just manipulates the first one!!
They fell out with my brother who is a direct neighbour to them, over croft land, and they were proven wrong, as a result he got rid of his livestock because they kept letting it lose on the road, and damaging his water supply (hill supply) , so he was too concerned to be able to leave his stock so he sold them - anyway, i've then just become an easy target i guess, and because they don't get a reaction from me regardless of what they do, i think it winds them up even more. These two characters are not liked by anyone in our community as they certainly appear to act without reason or justification, just because they can. They're just bullies. They don't have particularly happy lives - no.1 has a rather unpleasant husband who i believe is abbusive when drunk, and the other had a very nasty childhood, i believe they are just unhappy people and direct their anger towards the easiest target, i pity them.
It would be a lot easier if their was a genuine conflict or if i did something that they didn't approve of because then it could be resolved, but in this case, that isn't the situation.
Like i said, the situation used to make me very unhappy, but now i shrug it off, lifes too short to let people like them win by making me unhappy - and i'm a lot more productive than them because i'm not putting all my energy into negative behaviour, so i guess that makes me happy.