PSA: If your team has a lead, and your the ADC who's a bit behind. Don't split push.
http://matchhistory.na.leagueoflegends.com/en/#match-details/NA1/2387608732/231258967
This is a normals game but it's a prime example of an ADC who refused to group.
My team had 88k gold, their 85k, any team fight that was 5v5 was won but the ones that were 4v5 were lost. The ADC wasn't doing as well as the rest of our team so she decided to AFK farm and get caught out. This caused any fight thereafter, that the enemy team would engage on(not stupid we know not to fight on purpose without our ADC.) to be an instant loss.
Please, even though your role means "Attack Damage Carry" that doesn't mean you aren't the only person who can. Learn to get carried yourself so that you don't throw matches that were easily winnable if you'd have helped out. It's a good thing this was a norms because this type of game would have titled me to no end.
Btw i know many will say "Your a 24/9/9 kat how can you not carry." well that's very simple. Please reread the entire article lol
Sincerely, a Top and Mid main who's tired of losing to non-grouping ADC's.
Edit: Almost forgot for the nit picker's, if you don't have a lead, that's different there's a reason to turtle and catch back up but in this situation there isn't any reason.