reputation.

We are not promised that we would have a good reputation for the sake of God's truth, in fact the complete opposite is promised.

The Corinthian church was obsessed with reputation. Paul had to call them out by being sarcastic with them comparing the apostles lives to their lives (and what they valued).

1 Corinthians 4:10-13

"We are fools for Christ, but you are so wise in Christ! We are weak, but you are strong! You are honored, we are dishonored! To this very hour we go hungry and thirsty, we are in rags, we are brutally treated, we are homeless. We work hard with our own hands. When we are cursed, we bless; when we are persecuted, we endure it; when we are slandered, we answer kindly. Up to this moment we have become the scum of the earth, the refuse of the world."

He contrasted what his and other apostles reputations were to that of the "noble" and "respected" Corinthians.
Look at what Jesus says regarding the reputation of his followers:

Luke 6:22-23

"Blessed are you when people hate you and when they exclude you and revile you and spurn your name as evil, on account of the Son of Man! Rejoice in that day, and leap for joy, for behold, your reward is great in heaven; for so their fathers did to the prophets."

So, don't shun slander for the sake of the Son of Man, accept it as a blessing!