What do you say / how do you respond to negative comments in the workplace?

I’m managing a wide variety of staff and I find that sometimes they can be really petty. I continue to hear that they’re trash-talking one another, the organization, etc. etc and generally promoting an environment with low morale. I’ve told them it needs to stop immediately but I also want to provide them with contructive ways to stop it, should someone else try to engage them in it.

When someone approaches me with negative communication, an attempt to trash-talk, or gossip, I usually just respond ”Ugh, I can’t even go there. I’ve got way too much on my plate right now” or ”You know things here can get petty and negative sometimes and I just don’t want to play into it”

How do you handle it, diplomatically? Any good lines or phrases you always keep in yur back pocket to deflect those things?