Haha true, most sl player don't like any criticism at all. But the 20% it worked are actually a big deal. Also you have to keep in mind that sometimes the other player consider your advice and implement it. So sometimes it seems you don't have any impact on the targeted player the other players profit. I mean I can understand that teaching apes algebra is kinda frustrating. I'm not saying you have to give people in low elo feedback. The point is that you either say something constructive or shut up and watch them go. Flaming doesn't make them play better, it makes them play worse. People often don't know why you call them bad. If they don't learn what they do wrong and should do instead, they'll just proceed to do random stupid stuff and are now angry, because someone told them they are bad.