Can't just say chicken skin is bad. It would all depend on what the rest of your diet looks like. Obviously you should avoid it if you're on a serious cut, but otherwise a little every so often isn't going to kill you.
Personally I love it. Depending on how the chicken has been cooked and seasoned that is.
Potato skin I can take or leave. Sometimes I'll eat it but most of the time I won't.
Just because one can't understand a concept, doesn't mean that it is wrong.