It’s lazy. And often it means that you’re not really listening hard enough. The problem with this is twofold. Not only is it disrespectful to the person speaking to you (and they will notice, trust me), but it’s also a disservice to yourself. Because you wind up just going along with things you don’t really agree with. You forfeit the chance to think for yourself. And often you’ll look back and realize that you’ve agreed to things that are not in your best interest, or undercut your work, or that you don’t truly understand. Better to lock in and engage. Listen hard enough to form a real thought you can articulate with words. Then you can be sure of what you’re agreeing to and why you’re agreeing to it.