Intentional feeding is by definition when a player wants to feed the enemy and does so. "Not listening to your teammates" is not intentional feeding, even if your teammates are right. Because anyone can give bad advice and then report for intentional when you don't follow it.
It's not intentional feeding so long as THE FEEDER believes that they are doing what will help the team win. It doesn't matter how you see it. So long as the feeder thinks they're helping, it's not intentional feeding. If you think grouping is the best strategy, but they disagree and say split pushing will work better, you can't report them for feeding even if they die a lot. If they build Manamune on Lucian, ask them why. If they say something like "because I keep running out of mana", they aren't intentionally feeding even if they're doing poorly. They're doing what they believe will win them the game, EVEN IF THEY'RE WRONG.
I only report for intentional feeding if ONE of the following conditions occur:
- The person built
and started stacking movespeed items and is suicide rushing on respawn.
- The person is violating the AP Garen Rule.
- The person is openly admitting to feeding.
- The person builds two of the same UNIQUE Passive.
etc.
Basically, the AP Garen Rule (or sometimes AP Vayne Rule) says that you get banned if you build AP Garen or AP Vayne. When your champion has no scaling off of a stat and you build that stat, you're in violation. Stacking mana on a manaless champion, building AD on a champion with no AD scalings or auto attack steroids, building AP on a champion with no AP scalings, etc. It does NOT include sub-optimal builds. It only includes four things:
- Building AD on a champion with no AD scalings or auto-attack steroids.
- Building AP on a champion with no AP scalings.
- Building mana (with the exception of
and anything that builds from it) on manaless champions.
- Building critical strike or attack speed on a champion with no auto-attack steroids or abilities that gain power from critical strike or attack speed. (
passive gains power from crit, and
Q gains power from attack speed)
When people confuse intentional feeding with just being bad at the game, it makes me angry. We were all noobs once. Also, we've all seen power spikes happen. Riven is a prime example of this. You're laning against a Riven. You get three kills to zero against her. All of a sudden, she comes back to lane and wrecks you and snowballs from there. If Riven hadn't done that fight, as you're suggesting you would report her for doing, she'd stay behind, but instead she carries and wins the game. Because they've seen it happen, people think that it will happen to them. When they finish a top-tier item, it does happen (sometimes not to the degree they expect but it still happens). This is especially true of
and some other items that have a very powerful effect that isn't on the previous items.