hey, if thats the case Phoebe is always mocking Monica,Rachel and Chandler too.
just because she insults Ross doesn't mean sh e is not close to him. There are many instances in friends when she has shown her strong friendship with Ross. off course she is nowhere as close with him as she is with joey but its definitely not the weakest, Chandler and Phoebe share a much weaker friendship that these two.
and Chandler and Rachel do like each other a lot, just that not much is shown on screen, just mentioned implicitly once in a while.