It bothers me that any instance of being unclear in what you say, too wordy, overly technical, or demonstrating that the person you're talking to doesn't have a vocabulary appropriate to their grade level is considered to be the use of big words. Clearly, big means something other than what I was taught as a preschooler. Jam has some commenters referring to her use of big words.
Now, that is an example of tech speak. Not a severe one - I'd be willing to put that in a report, it's reasonably clear. However, it's hardly using big words! At least when I got told that "tact" was a big word (this was by a peer in grade 6 by the way) they could claim that it was a complex word. (They were wrong, but they can claim that and I understand what they're saying).
If someone complains that the words I'm using are too confusing, my response is to use simpler words, not to be less detailed in what I'm saying. If, instead, the problem lies in how the (quite mainstream) words are being used, communications will not have been improved at all. Ironic that the original complaint was about lack of communication, eh?