Honestly, a 'good' WTF doesn't offend me at all.

It's just a form of expression that frankly doesn't shock me at all. I know a lot of very good people that use WTFs in their common language. It bothers me a lot more to 'see' certain attitudes in between polite words. Now, using WTF can be a way of provoking other people, of course. Not good, of course. Bottom line: use WTFs tastefully and our friendship will be untouched.

-- José.