Let´s say a German person makes fun of Dutch people, just in a fun or joking way. Then someone else notices the German person does the same things that he was joking about Dutch people. How would this sound in Turkish, to jokingly call the German of acting hypocritical: 

Hollandalısınız.

Hollandalıdan farklı yok.

Senin de Hollanda´lıdan pek farkın yok.

Shouldn´t it be Hollandalıdan? As in Hollandalıyım? Because the ´lı´ shows the belonging to a specific place.

You are right. It should be without apostrophe.  ´´Hollandalıdan´´