In real life firing means you made the wrong pick and is not looked upon as a good thing unless you are a sociopath. I suppose if you came into a company to clean house some would view it as correct but they are probably shareholders who have perverse incentives.

Long story short, Americans don't generally like bosses and don't approve of firings unless it is obvious the choice was correct, for instance firing someone who is toxic.

Having had to fire someone as a director myself I would think it strange to be brought up in an interview and probably a red flag.