Aren't we overthinking this a bit guys?
I really doubt the forum would get as restricted as dst is afraid it might.
Even before the proposed changes some posts were removed due to "aggressive hostility", what's added is the warning point.
Everyone can see if he/she got a warning point on his/her account.
If it indeed was because of a misunderstanding/language issues, I'm pretty sure it can be explained and warning point removed.
On the same note, if such thing happens one can learn when she/he's crossing the line.
I don't believe sarcasm or hostility can or should be removed from free speech. But as with everything, it can be abused and pushed too far.
That's where mods step in.
And I do believe they wouldn't be too anal about it. Just anal enough :P