Data acted completely out of character when he was confronted by Hobson in "Redemption2".
This is the dialogue between the two:
DATA: By order of Starfleet, I hereby take command of this vessel. Please note the time and date in the ship's log.
HOBSON: Excuse me, sir. I'd like to request a transfer.
DATA: May I ask why?
HOBSON: I don't believe I'd be a good first officer for you.
DATA: Your service record to date suggests that you would perform that function adequately.
HOBSON: No, no, no, that's not what I mean. I don't think that I would be a good first officer for you.
DATA: Why?
HOBSON: Frankly, sir, I don't believe in your ability to command this ship. You're a fellow officer and I respect that, but no one would suggest that a Klingon would make a good ship's counsellor or that a Berellian could be an engineer. They're just not suited for those positions. By the same token, I don't think an android is a good choice to be captain.
DATA: I understand your concerns. Request denied.
After Data said "request denied", he turned away from Hobson, ignored him and went about his business. That is totally not Data.
The "real" Data would want to explore the matter further. Data would want to know more about Hobson's motives and would engage in a longer conversation with Hobson, asking Hobson more questions. Data would want to know more in order to get a better understanding of humans and their motives.
On a tangential matter, Hobson was right. Data is not suitable to command a ship. Data doesn't get it. He doesn't get human behavior. It is crucial that a commander understand the people that he is leading.
In the ep prior to "Redemption", "In Theory", when Data asked Guinan for advice about dating. She responded, "don't look at me". Data literally turned his head around so as to not look at her. Data just doesn't get it, that in addition to simply not understanding human relationships. He is not command material. His performance as commander didn't seem particularly Data-like either.