It’s never right to be angry with God. It’s a sin. When we are angry at Him, it’s an assault on His character. It’s, in essence, saying to God regarding the circumstances that have caused such strong resentment in us: You are not right. You are not good. You are not wise. You are not loving. And none of those things are true, no matter how hard life gets. What is true is that God is unbelievably good and loving to us, and is actively working out a wise and right plan, no matter how hard life gets. He will make it all right when He makes it all new. So, be mad at sin, brokenness and Satan. But never be mad at our good, good Father.