The point I'm making is that there is a risk involved. You can't just say "if they get offended it's on them" because they might e-mail the VP of your company and the VP of your company might see firing you as less trouble than facing controversy.
And if there's one lesson I've learned in life its that no amount of proof reading will keep you from offending some people. So that point's moot.
Increasingly, you can't. I understand your decision to avoid making your own comments public as a rule, but once you've said something to someone, it may go public through their use of twitter, facebook, et al. As more people start lifelogging and vlogging, it will become likely that you're effectively in public at any time, even in the "privacy" of a friend's home or your own.