Really? A support has the right to CS, especially when their ADC isn't even in lane.

Last ranked game I played (we won. Yay) I was in lane just stopping the enemy from pushing and destroying our tower. I was playing Nami. My ADC had backed and was just heading to lane. The enemy left, too. I needed a bit more gold for sightstone, so I started farming about 4-5 minions under tower. My ADC starts yelling at me and spam pinging me all the way from base. I just back off and head back to lane after recalling, since I couldn't buy a sightstone on that back and was already low health/mana (so I had to recall). He then proceeds to yell at me again for not having sightstone. I had already I pinged how much gold I needed for sightstone earlier. My point is, if you're playing ADC, and your support needs gold, let them take a few CS. And I mean the CS that you're never going to get anyway.

Moral of the story: let a support take CS that will not affect you (will not destroy the wave and you're not going to get it anyway).