The problem with taking offence is that it is really hard to figure out what to do with it after you are done using it.
Offence is not given, it is taken.
Better to just leave offence on the table and walk away.
Offence untaken quietly disappears.
Responding to people you disagree with [and in some case trolls] with love, grace and a kind answer is often more likely to affect them and other people watching from the shadows.