It also really depends on your delivery. You can shoot down ideas and make counter-arguments in friendly & supportive ways, or smug & arrogant ways. I can see

It also really depends on your delivery. You can shoot down ideas and make counter-arguments in friendly & supportive ways, or smug & arrogant ways. I can see why you'd think that, I made the same mistake earlier, but see there's this problem here... vs No, that's obviously wrong, why would you even think that? Let me show you the right way...