Group project partner refuses to do any of the work, even when the member doing all the work falls ill:'He acted as if he was entitled to get an A like I did'

That kid in your group project who didn't do any of the work, instead deeming their membership to be enough contribution to qualify them for a good grade, gives off exactly the same energy that a lot of managers do… taking credit for the success of their subordinates' efforts purely by merit of their presence. In fact, a lot of them probably go on to be managers who do this, their confidence propelled by that earlier undeserved success with a lack of effort or accountability.

Disappointingly, this phenomenon isn't just isolated to grade school or the workplace. If you choose to continue on the academic route too, group projects are just preparing you for your lab work in grad school, at which point the professors will be the ones taking credit for your work, leaving your name off of any papers they publish even when you make significant, sometimes vital, contributions to them. Maybe this is why they assign group projects to their undergraduates, adjusting them to the possibility that others will take credit for their work early on.

When this student's group project partner refused to do any of the work, leaving them to do all of it even after they were hospitalized and unable to move forward with the project, they ensured that they weren't going to share their grade. However, the professor unfortunately stopped short of failing them on the project altogether.