If you see a teammate that is clearly building some wrong items, do you try to tell him?
Sometimes I played with my friend and get matched up with some low elo players (like silver, gold, for example), and noticed that they were getting items that are not the best based on the situation. I felt that it was especially common in low elo adcs, for example, they got burst down in every team fight and still refused to get any defensive items that could at least give them a few seconds to deal damage. When I tried to tell them, they usually say something like "you are not better than me, why should I listen to you!" "shut up!" "I buy whatever I like"... Have you guys seen people like these? Do you tell your teammate if you think there are better built options?