Look at the way the apostle puts this. It is maybe clearer in the Greek than it is in the English, but what he does not pray for is exemption from oppression and persecution and trouble.
If you witness, you will soon come across unreasonable people, who will burn against you and try to do all sorts of things to impede you or to disturb you. They will stop at nothing in their prejudice against you, to obstruct you and to stop you and prevent you from witnessing. You cannot pray for the avoidance of that, but for deliverance from that. God will strengthen, God will deliver in his way, God will vindicate you and bless you.