What does it mean, to not let your good be spoken evil of?
“Let us not therefore judge one another any more: but judge this rather, that no man put a stumblingblock or an occasion to fall in his brother’s way. I know, and am persuaded by the Lord Jesus, that there is nothing unclean of itself: but to him that esteemeth any thing to be unclean, to him it is unclean. But if thy brother be grieved with thy meat, now walkest thou not charitably. Destroy not him with thy meat, for whom Christ died. LET NOT THEN YOUR GOOD BE EVIL SPOKEN OF. For the kingdom of God is not meat and drink; but righteousness, and peace, and joy in the Holy Ghost. For he that in these things serveth Christ is acceptable to God, and approved of men. Let us therefore follow after the things which make for peace, and things wherewith one may edify another.” (Romans 14:13-19). It simply means that we should not purposely do things that we know would cause another Christian to stumble, even if there is nothing wrong with doing those things.
“We then that are strong ought to bear the infirmities of the weak, and not to please ourselves. Let every one of us please his neighbour for his good to edification. For even Christ pleased not himself; but, as it is written, The reproaches of them that reproached thee fell on me.” (Romans 15:1-3)
So it boils down to “What is our motivation for our words and actions?” Who are we trying to please? Ourselves? Others? God?