People often remark when a frum Jew publicly acts with mentschlichkeit that he made a "Kiddush Hashem".
What people seem to mean is that it is good PR for the Jews.
Kiddush Hashem is MUCH more than that.
Another point: Before we get to the most elevated plateau of Kiddush Hashem, we must remember that there is great in value in doing what is right b/c it is right. Being honest is an obligation whether it creates a Kiddush Hashem or not. Being polite is an obligation whether it makes a Kiddush Hashem or not. It is not ONLY about making a Kiddush Hashem but also about just being and doing what is טוב וישר בעיני השם!!!