At what point is sheer incompetence considered griefing?

Not gonna name any names, but a certain match made me ask this question.

If you rush a striderhub, reclaim all the metal on the frontline and funnel it into more striders, afk the striders and then proceed to donate roughly 30k metal to the enemy team, is that incompetence, or griefing?

If you play a team game with 0 regards to your teamates, i would say you are griefing. Especially if youre VERY much aware of how selfish your playstyle is.

What are your takes on this topic? Is there a limit on how incompetent you can be before its considered griefing?

Additionally, I think it's always good to ask directly and politely that person to stop doing it, or to be careful or to help front. He will probably not change his behavior on the spot, but he can't say afterwards "but everybody was ok with it" (seen it happened).

quiltedquickerpickerupper Level is very trolly.

Someone who disregards the fact that they know how to play the game, while actively disrupting their team, should be punished.
Especially those who have experience, yet disguise themselves as someone new, or having no experience.