Appreciate and be grateful
People needs self satisfaction and being at inner peace, that comes when they are acknowledged and appreciated by someone. Self worth is most important factor for your inner thoughts which are always at struggle to come at conclusion. Even a small smile and thank you gives a soothing to the mind. Everyone is struggling in their life to prove them their existence. If small appreciation and encouragement make someone feel better then there is no point in missing it. Being critic is also important in human civilisation, that's how it has been evolved. But with no intention to bring someone down or belittle them. Everyone loves to be appreciated and encouraged. And being thankful and grateful will have positive impact.