Most likely because they can't think of anything better else to do, which is pretty sad. If they can't say anything nice they really shouldn't say anything at all. They may not care for your posts...which is fine they are entitled to feel such, and good for them...If I were you I'd just ignore their comments...they'll eventually stop...it's like dealing with a toddler having a tantrum...spankings usually don't work...ignoring them does.