When a person says "God has blessed So-and-so's son with a wonderful exam result", it can appear different from saying it in a passive way: "So-and-so's son is blessed with a wonderful exam result," or to just say it privately. Let's say your son has also got his exam result and it is poorer than expected. When someone makes the first remark in front of you, you might feel that God is playing favoritism or that you have done something less deserving of God's favour. You might feel hurt.
Christians often openly give praise to God for all good things that happen around us. However, believers and non-believers alike all have their moments of good and ill fortune. The only difference is that for believers, ALL things happen for the good of those who love Him and who are called according to His purpose. The "all" can be good or bad in the way the world sees it. Our Christian faith helps us to humbly accept what God has in store for us