This whole thread seems a little too "either/or" to me. Either you fly like there are 300 Aunt Ethels in back, or you fly like Maverick--dangerous <sound of teeth snapping>. Throw the FOM out the window, because we're gettin' crazy!!!
There is a lot of middle ground, in which many professionals can reside, in my opinion.
At my operation, we have flows, profiles, checklists, rules, and regs that must be adhered to on every flight. But there are a lot of comfort considerations of flying pax in an unpressurized piston twin that go out the window if we're flying an empty leg. The GOM/FOM/NPH/QRH are the bibles of safety and how the company wants their aircraft flown, but rarely set standards of comfort.
To me, being a professional is all about having the judgement to make the right decisions at the right times. It has nothing to do with how smooth, or not smooth the flight is. There is a time and place for both. I'll take a slam dunk approach when flying empty versus with pax. But I won't do anything contrary to the FOM no matter if I'm empty or full.
Regarding the original story--I'd consider it unprofessional regardless of pax, but only because it's probably contradictory to published company procedures. I don't know anything about flying a CRJ. But I know at my company we're supposed to lift off at Vsse, maintain 112 knots (+/- 5) to 400 AGL, then make initial turns as shallow as practical. The only exceptions would be to comply with a departure procedure or wake turbulence avoidance. It says all this plain as day in the NPH/FOM.
I'd imagine the airline in question has similarly defined procedures for takeoffs.
If a pilot intentionally flies the aircraft contrary to these standards, guess what? They're not being a professional.