I've said it before and I'll say it again, but it is the SUPPORT that dictates the bot lane. If an ADC main has a good support, it's almost a promised win bot unless the enemy is better of course. If your supp is bad then there is NOTHING you can do. At all. A support dictates far too much in the lane.
Supports decide when to engage.
Supports ward (even though you should be warding too)
Supports do the disengagements.
Supports poke.
etc, etc
ADCs are hopeless without supports. That's why they need them. It is a HUGE responsibility to be a support and a bad one can potentially put an ADC too far behind and they may never recover. Again, ADC's are so demanding because they KNOW this. But some support "mains" don't.
If you are not stepping up to pressure the enemy supp from poking me and I back off and miss CS because of it, it's just as much your fault as it is mine. You HAVE to have a presence in the lane and you HAVE to pressure the enemy laner otherwise you are completely worthless and you are enabling our lane opponents to pressure us without repercussions.
Also, do NOT engage when a wave is pushing us far back under our tower and we're taking minion aggro. A lot of supports engage at the WRONG time and get upset when the ADC doesn't follow-up. Also, it is MUCH harder for an ADC to poke than a supp due to the fact that the ADC will be focused and CC'd instantly. They have to either 1) Have their supps covering for them or 2) Poke whilist their supp is being poked at/engaged on. Too many times has my supp been caught only for me and my supp to instantly turn on their adc and burst them to hell. ADC's HAVE to be careful and they can't afford to put themselves in harms way.