Serving God is actually serving man
When we serve man in order to gain respect, appreciation, or to please people and make a name, then surely you cannot please everybody. However, if you serve God by serving man, then the Lord will certainly be pleased and would shower you with rewards according to your faith. In other words, if we serve godly in utmost sincerity, there will be no favoritism and prejudice - and most importantly, God will make all people be delighted with you.