As normal and sane as Farrah seemed when she was with Derek's parents, it was such a one-sided exchange. It was her talking about how heart broken she is that her one true love was taken away from her - all evidence of that relationship to the contrary - and having to be comforted by the people who LOST THEIR TEENAGED SON! She uses his death to get attention and sympathy, which is bad enough in general, but to do it around his parents is truly sick.
(Also, hi, I'm new)