All the visitors of our servers have to follow our rules and if they not, then they will be asked for to that or punished. Servers have to be a friendly place and if someone is talking 'over the red line' then admins/members have to remind him what is acceptable and what is not. Common sense is the key. In a friendly talk/fun even a bad word can be tolerated but there are same limits. If it's disturbing or insulting then members/admins have to act... just my 2 cents.