Keep in mind that there are many fields in real estate such as brokerage (leasing and sales), real estate development, property management, and asset management (portfolios). I worked for the brokerage side at Jones Lang LaSalle. As with any real estate brokerage firm, it's a cut-throat environment because it's all about sales and how much revenue you can generate for the firm.
I have seen brokers work together on a large project for a client, and at the end of the project they fight over commission splits by pointing fingers and turning the conference room into a war zone. It wasn't pretty. But these scenes are rare, and people do learn from their mistakes. In other words, these two brokers won't be working together anymore in the future. In fact they don't even talk to each other in the office anymore.
Is brokerage for everyone? Not really. It certainly is designed for the lone-wolf who is capable of hunting his own meat. Of course, no one expects you to catch big fish as soon as you begin in the business. Usually they pair you up with a senior broker-mentor to learn the ropes first. Brokerage is less about teamwork and less about survival of the fittest. If you can't pull your own weight, no brokerage firm has any reason to keep you on board.