Maybe your neighbour don't understand that when you post a joke, it meant that you tipped as well. If it were a young child player, she might not know if you did not state clearly that you tipped.
And sometimes I get a wall post that people tipped but as I am online, I check the newsfeed and their "tip" didn't show up so I don't know whether to believe it was a trick or a phone issue (IOS vs Andriod problem)....
I delete neighbours who do not play the same style as me quite often. I don't feel it is wrong. This is a game and I prefer to play it my way whereby it is fun for me. But sometimes I do remind neighbours what I want because when they added me they should had known my request as it is posted before my ID.