Privately owned forum, owners/mods can do whatever they want. Agree with above poster, freedom of speech and racist remarks are totally different. If you can't communicate your thoughts effectively without making racial slurs or cussing, then you have some other issues you may need to look into.
'11 BMW E92 ///M3 - ZCP and DCT
'15 Ford F-250 - Lariat, 6.7 Powerstroke Turbo-diesel