When something is rejected, there could be a few reasons.
It could be a defect, or it didn't meet up to expectations, or that there is a question of quality or whatever.
When something is rejected, it is usually thrown away and disposed of.
But when a person is rejected, it is quite a different matter altogether.
It wasn't a question of defect or expectations or quality.
In the 1st reading, Joseph was rejected by his brothers because of jealousy.
And that rejection turned into an evil intention of murder in order to get rid of Joseph.
In the gospel, the parable was about the people rejecting the ways of God and the servants of God were also gotten rid of in murderous ways.
It is usually easier to pick out faults and failings in others and consequently they are put on the "rejected" list.
But let us remember that God chooses the rejected, the unexpected and the lowly to fulfil His ways.
Let us not be too quick to reject but rather to accept the faults and failings of others.
We may find ourselves accepting and coming to terms with our own faults and failings and with the grace of God find healing and peace.