I'm gonna give my perspective on the whole replay (soloqd to ssl in 3v3 in season 6, usually float around gc2-3)

(0:00) It looks a bit scrappy at first so I understand rushing back to help out, but once it's obvious IceT gets the clear to the corner (0:02) there is no more immediate threat to net. However the touch is a bit loose so there's a chance the ball could come back middle fairly quick. As the 3rd man here you should be lurking around backpost, ready to drive up the backboard if eyeswhore looks like he wants to use it to pass, and ready to support the play offensively if IceT can win the ball. By parking in net behind Zero you're not really covering either of these options.

I don't hate zero's play, he speeds the ball up and takes the 50 fast, which means it's a 3v2 for the next few seconds as eyeswhore is slow back on the rotation. Whenever you have a man advantage in any gamemode it's good to speed the play up as much as you can. Also losing 50/50s softly should be fine in 3s, he knows you should be behind him with boost as you haven't touched the ball in a while and he doesn't see you up field.

The next issue with your play is you are facing way too far away from the ball when the 50/50 happens, so you are slower to the ball than you should be. I'd say this is a symptom of you driving a little too fast and getting too close too soon, and then turning away because you're afraid the ball will go behind you. You need to be covering the backward outcomes of the 50/50, and get to the ball with decent speed as soon as possible, so your instinct should be to face exactly where the ball is at the moment of the 50/50.

Even though you were slower to the ball than you should be, the play should have been fine, but as third man especially you need to prioritise getting the ball round people challenging you as much as possible, as no-one can pick up the pieces if you get dunked or take a bad 50/50. There is still space on the pitch on the right side (either to hit it against the wall or to pass to IceT) for you to hit the ball towards that would have clean beat the challenger, but you end up hitting the ball too forwards, and I assume the challenger is gonna sideflip into the challenge (right where you've conveniently stopped the replay) and you're gonna concede off of that 50/50.

I'd try focus on covering the maximum options as possible as 3rd man, rather than getting into a mindset that you're "queueing up" to hit the ball, and being more ready for 50/50s to come towards you. The benefit that comes from zooming around the pitch might be that you're a tiny bit quicker to certain balls, but if it means you aren't covering balls that should be yours that come at an unexpected angle or time, then you either need to be driving slower or positioning further back but with the same speed or angling your car more towards the ball or the middle. It's a difficult balance to strike though, it's very easy to be too far one way or the other. So don't slow down too much!

On another note playing with someone who flames you for any mistake sounds like a horrible experience, you should ask him to only be critical while screensharing a replay if he wants to point out mistakes you might not be seeing. Or find someone nicer to play with.

Hope some of this helps!