Sefer Chofetz Chaim chapter 9 halachos 2, 3

More examples of Avak Lashon Hara

  1. One should not praise people in front of a crowd no matter how much praise because it’s many times inevitable that someone who doesn’t like him will be in the crowd and start trash talking and downplaying this person’s praise. However, if (a) you know there is no one around who is his enemy, for example nobody knows him. Or (b) He is such a good person that one can’t find faults in him so even his enemies won’t say anything bad about him or will be immediately shut down if they try, then it’s permissible to praise someone in public. This could be why it permissible to talk about honorees at a banquet. Just don’t go overboard with the praises.
  2. You shouldn’t sit around with a group of people praising the gedolim, the Torah leaders of the generation because people will start comparing and it will inevitably turn into lashon hara, which is worse than speaking lashon hara about a regular Jew, because it might askew one’s attitude towards Torah Judaism. Hashem takes action against those who malign those who are closest to Him.
  3. One shouldn’t say anything which might cause others a monetary loss: A. A guest tells the world how great his host was and everyone flocks to get a meal by the host which might become too overwhelming and inappropriate people might get in also. B. Some publicizes how nice a person was for giving him a loan. This might lead to people who are con men asking for a loan and stealing the money.
  4. You should say things that sound suspicious and might sound like lashon hara. For example, if one warns others a few months later, when there has been calm in the area for a while, “I knew the whole time the guy was a thief.” Well why didn’t you say something beforehand when people could have taken precaution to protect their money?