If you noticed you didn't peel for your ADC...
And they ask for peel for the next fight, don't respond with "Your positioning was shit!" when you know for a fact you have no idea how he positioned because you forgot he existed the moment that team fight started. Cause sadly, a lot of these mage supports don't really have the tools necessary to solo peel for their adc against anyone who can't just be melted by their "sup" damage.
And of course a lot of em are just auto-fill and also forget you exist once the team fight starts. Just thought I'd get that off my chest, cause I'm sick and tired of this "If you died as adc your positioning must've sucked!" Narrative.