Matthew 5:11 Blessed are you when they revile and persecute you, and say all kinds of evil against you falsely for My sake.
When Jesus was speaking these words He was talking to the disciples and warning them they should not expect to be kept safe from all reproaches in life just because they were disciples.
Bad things will not just be people hitting you or other physical things, they come in words and actions which bring emotional ill feelings as well.
The evil one will use any and every opportunity to discredit things we do in the name of Christ. We need to be careful and be alert at all times and trust God for direction.