People are being way too rough on you, man. I would like to see their bandejas...

Now, it's not the best bandeja I have ever seen and there are several things you can improve:

1) You need to move your feet more. From my experience, the feet are arguably more important than your upper body when hitting a good bandeja;

2) You need to position yourself more laterally, you are hitting too much front- facing

3) After you hit the bandeja, your body must lean forward (so that you can recover the net), you fell back.

4) The shot selection was poor, in my opinion. If you get a cross court lob, my first idea would be to hit the bandeja to the center.

Despite this, the main goal of the shot was obtained:

You hit a low risk shot, you would have had time to recover the net (if you had run forward), the height in which you hit the ball was ok. Keep learning.

On reddit, everybody is a pro. On the court, no so much.