Remove yourself from low energy conversations such as those containing gossip, bitterness, and complaining.
Because if you think about it, how does all that help you really?
It’s always important to realize that people who criticize or “talk bad” about others often only reflects more of of that energy back to themselves.
None of those things that are negatively-inclined help someone’s personal growth, so it is often “a simple reflection” that talks or says more of those involving themselves in negative and unproductive activities instead of the people they criticize.
Many optimists know that whatever you talk and express, only brings more of that into your own experience.
This is why it is important to talk happiness, praise and encourage people often for their small successes, and being genuinely interested in the personal development of others. What you plant at any point in your life will yield fruits of your own making.