It takes a lifetime to make close friends in the u.k and we all come over here expecting to do the same overnight.
Sad to say there are a lot of selfish, two faced folk over here..however there are a lot of genuine, nice, kind and loyal folk over here as well.
You just have to sort out the good from the bad , which takes time.
You also have to realise that you're not going to get on with everyone, no matter how much you try.
As for rudeness..well been on the receiving end of some really cutting, bitchy remarks from an ex pat. Just walk away. They will be seen for who they really are in time.