This theory is about the MCU Hulk bit will have elements from other marvel titles such as Hulk and the Avengers Assemble cartoon series. My theory is the Hulk has a reason to be angry other than Bruce himself being angry. It's because he's in a cage. I'm avenges assemble and hulk, the hulk is able to communicate with Bruce through his reflection and his dreams respectively. We don't see this in the MCU. I think this is because Bruce puts more effort in actively suppressing the Hulk. Which is why he's angry. He doesn't like being trapped. That's why Hulk isn't as angry in avengers. He was let out.
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