Suggesting to someone that they sell their shares if they're unhappy with certain aspects of their investment is not a helpful way of continuing a discussion and is not a particularly original remark.
When the discussion is merely bashing and negativity based on opinion then the discussion has no value and only serves as a distraction to meaningful dialogue. I more then welcome negative comments based on fact that will serve an informative purpose. But just bashing because you are unhappy - sell your shares and move on.