Blue Buff: Unless it's an ADC who relies heavily on spells (Ezreal, Corki) or an ADC with a strained mana pool (Sivir, Draven) they should not take blue.
Red Buff: ADC's need to kite. An on-hit slow helps with that. Unless somebody else is going to be more active on the map (or they simply need the immediate regen) it should go to the ADC.
Farm/Kills: An ADC is a carry. Carries scale the best with gold out of any role, so your ADC has farm priority unless you've got an Azir, Yi, Fiora, or something like that.
Peel: Duh, they're your carry. If your carry dies first, you're probably gonna lose the teamfight.
Praise: It feels good to be noticed. You should praise your team when they do well. This is not exclusive to your ADC.