You can't give in to demands, but you also can't ignore them - They may just be some individual dislikes to the way things are ran by you, or they could be a wider-spread dislike by the community and they are the only ones gutsy enough to say so...
Constructive criticism works well and I encourage it; Destructive or otherwise rarely gets tolerated by me and if they cause more than their fair share of problems, they are kindly reminded that they have the option of behaving, leaving of their own accord or being assisted
Chris