Depends who you are against.
I just had a Vayne as my ADC and i went Nautilus Support (my main support) vs Ashe (tele and exhaust) and a Blitzcrank(flash and exhaust).
Yeah, i let her farm, we poked them but the minute i landed a hook she was usually right there to hit them a couple times. Not every hook has to be a kill, just send a message. Especially because she didn't have heal and neither did Blitz.
If he's over extending and practically tower diving, don't join, he'll get the hint soon enough. It's hard to get some people to understand how to properly play or lane, they don't want to be told what they are doing wrong most of the time and usually think they are always right, welcome to the internet.
In my eyes, first 10 minutes is heavy farm for ADC. I will try to harass and keep a presence in the lane as much as possible so they can farm as much as they can. If i see a chance for an open kill, i will usually go for it and hope they follow up. If they don't and i don't die, it's okay. I'm not mad. We'll get them next time. I pushed them away from lane and they are falling behind in CS.
Just try to keep a clear head and not let them put you on tilt(getting angry or frustrated). It's hard with this game at times but it's the one thing you have to do because once you start tilting, you make bad choices, get angry and everything goes to hell.