I'm doing a rewatch of Breaking Bad and it's insane how many problems Mike and Gus caused for themselves by refusing to give Walt or Jesse a straight answer. In season 4, when Hank is getting wise to Gus, Walt keeps warning Gus and trying to sabotage Hank's efforts, but is given no indication for whether or not they're taking these warnings seriously. Later on, Jesse takes Walt's side after Brock gets sick because Walt and Jesse still believe Gus ordered the kid who shot Combo to be killed, and at no point does Gus tell Jesse "The dealers acted on their own, I'm sorry about the boy but I had nothing to do with it" even if it was a lie. Hell, Mike would have solved a lot of issues in the bar if he'd just told Walt "Stop being paranoid, just do the job and Gus will have no reason to get rid of you" rather than beating Walt up and letting him stew in fear.
So, it's not exactly out of character for the dude, but yeah it is dumb.