What can I do, to make my support play SUPPORTIVE

It happens to me, and freinds as well, that a lot of supports out there do NOT buy a sighstone, take kills, do not buy a moneyitem ( cause they plan taking kills) So I dont want to tell anyone to buy certain items, but if i have to buy a sighstoen as adc i get reported. If my support doenst ward, goes full ap and plays 10/3/0 thats fine. It might not be worth a report but still, any ideas how to deal with it?
Report as:
Offensive Spam Harassment Incorrect Board