People undermining islam and muslims

There are people who say that they dont like the West and their customs, way of life, secularism, etc… What I would like an affective answer for is the following: When these people (Ex: Muslims) say that the West is corrupt and all that, other people attack them and say: Well, then why do you live here in the West if you dont like it? How do we respond since they have a very good point?