When you don't play the meta
When I win lane with my adc and then things go down hill because we refuse to group.
"Wtf is caits build?" -After we get Aced
We won the game and all, but like. This shit is dumb as fuck, we won lane and our jungler refused to help the 2v4 situation between Pantheon, Graves, Morgana and Annie. I was Soraka and my adc was cait, she didn't comment on anything at all but that is bullshit. I had a problem like that when I won lane and built cleaver on Sivir first. I was ahead and built cleaver because I was capable of getting kills more often with that often and if they built armor then I could get somewhat of a small time gain to prevent them from having effective armor.
People don't have to build a specific item and then get rampaged because of other shitty people thinking that everything needs to be played the same over and over again like this wasn't a video game!
swap out for a
There is no reason to not do this. Also upgrade it asap.
and
it's kind of standard for first four items:

and one more offensive item, like either
or 
on
is bad, maybe unless you're on an ARAM with at least 3 other ADs but even then I probably wouldn't do it.
in aram, do people not understand how important it is if your enemy has stealthers? even if they don't that's a free bush check right there ontop of ad (a plus), crit (another plus), a reveal on crit (handy) and a bleed passive (pretty meh but has uses)