I feel the way I communicate has been influenced strongly by voice training - I've noticed in particular I say "I feel" a lot in similar circumstances. (Apparently, valuing emotions above thought is some paragon of femininity? I'm not sure I agree with that.)

I am reluctant to go for the direct "wtf?!" response, because as above, it bruises egos and people get defensive - and that is unhelpful to actually resolving issues. I tend to phrase it as "Perhaps I'm confused, but...". (One advantage of this is that sometimes, I am wrong, and this gives someone an opportunity to explain why, and in the process hopefully re-examining their thought process and testing it just in case.) I think I caught that pattern, as well as excessive usage of "though", from a good friend. One interpretation of this is that perhaps I've spent nigh-on 2½ decades being confused. <g>

There is, however, a place for the genuine WTF. I reserve it for "there's no way you could be that stupid" situations, like someone cheerfully telling me about the 256-bit encryption they used, and my discovering it's RSA-256.

The management-by-Perkele has however seemed to work to keep the Linux kernel clean up 'til now, although they don't really want to insult people.