What does 2 Corinthians 10:2 mean?

Some critics have said that Paul was bold in his letters, but weak and unconfident when talking face to face. Paul does not deny that he's gentler in person than in writing. However, Paul turns that point into a warning: the Corinthian church doesn't want him to be as strident as he's able when he next sees them in person. He has appealed to them by the meekness and gentleness of Christ, suggesting that what other see as weakness is actually Christlike meekness. Paul is prepared to set that aside to be truly bold with them, if needed, especially with those who have been accusing him of walking according to the flesh.

Based on Paul's earlier commendation of himself and his fellow workers for the gospel, it seems that false teachers among the Corinthians were accusing Paul of being a false apostle. Perhaps they accused him of lack of integrity. Or they suggested he was working only for his own gain. Perhaps they accused him of planning to take some of the collection for the Jerusalem Christians for himself. Paul warns that he will show boldness to those who suspect him or his team of self-serving motives. Or Paul may mean something else by the phrase "walking according to the flesh," as revealed in the following verse.