If you censor someone is it a sin ?

All depends whose soapbox you are censoring, personally I experienced that just recently and I think it is very telling about the person who enforces it so I just let them get on with it and think "they protesteth too much" which to me shows fear so theres no winners but you certainly don't say what you really think any more to the person who does it anymore so they stay deluded and you don't waste any more of your time with them. As far as been a sin goes, Its just a sin that people don't respect others enough to have their say!