I never saw this movie but have heard of this scene. Is there a reason why Blonsky tried to commit suicide by Hulk by letting himself get kicked?
His arc was that he wanted to get more power and be more powerful, which is why he got the serum injection in the first place. He was actually juking the Hulk in close quarters and felt like he was getting the upper hand because the Hulk literally did not land a single hit on Blonsky.
When the Hulk eventually broke free of the trap and wrecked everything, Blonsky walks up to the Hulk, pulls out his earpiece (Ross is yelling at him to pull out) and insults the Hulk, which causes the Hulk to kick him.
Basically, the dude is on a power trip and wants to be even more powerful and the strongest one there is (which is why he gets the dude who is the future Leader to do that gamma modification or whatever)