Please Say/Whisper the Words out Loud
Lesson 1
Attacking the motivation of others when they do good deeds can easily be onaas devarim (verbal abuse). For example, saying someone is only doing a certain kindness to get attention, or giving tzedaka for tax credit purposes.
Lesson 2
If someone is affiliated with a particular institution, be careful with what you say about that institution in the persons presence. Be careful not to badmouth, criticize, or put down the system or people who work there. This can make the person feel bad about themselves, and also change their perspective about that organization.