The #BlackLivesMatter vs. #AllLivesMatter struggle has reached the Facebook headquarters, and staffers are silently facing off on company chalkboards.

Apparently some people on the Facebook staff have been writing the term “Black Lives Matter” on the community chalkboards in the office…and some either clueless or downright hateful person has been coming behind them and crossing it out, replacing it with the term “All Lives Matter” instead.

After having several talks with the staff about how inappropriate and dismissive it is of fellow staff members’ feelings, and seeing that there has been no change in the activity, he was forced to pen an open letter not only explaining what Black Lives Matter TRULY means, but threatening disciplinary action on whoever keeps it up: