Can We Be Angry at Prodigals?

Recently, while reading Luke 15 and the parable of the prodigal son, I began to reflect on the character of the father. Preaching on this parable tends to highlight the father's loving welcome, his compassion and grace upon both sons, his willingness to come out to greet both sons at great cost in terms of social shame and dishonor, and his great joy at receiving the lost son. This is right and good. But I think it’s worth considering Luke 15:20: