I've noticed this as well in the past, particularly when I was a beginner. Basically, just because someone is bigger than you, certainly doesn't mean that they know better.
Often, the ego overtake the desire to perform in the Gym, and you get guys who lift heavier weights than they can manage but with poor form. Form is the key with weightlifting, so make sure you can perform GOOD reps with a CHALLENGING weight rather than POOR reps with a RIDICULOUS weight. I've lost count of the times I've humiliated guys much bigger than me in the Gym by using the correct technique, and getting them to do likewise.
For me, the big mistakes are:
Squats : Stopping early, before the thighs are parallel to the ground. Means you can squat heavier, but eventually wears out the knees, plus you don't get a full movement on the muscle.
Bench-Pressing : Raising the back off the bench means that you can bench heavier, but it's very poor form. A slight arch in the back is essential, but not too much.
Bicep-curl : As you said, leaning back too far, or swinging the weight up and down with no control are the big two with this exercise. It's best to pin the elbows to the side of your body when performing barbell or dumb-bell curls.
Above all : Don't be tempted to lift heavier with poor form. If you do, you're not going to develop properly, and you're certainly putting yourself at risk of injury.
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