If it was a case study in the use of hesitation words causing misunderstandings in multilingual environments and that was within the scope of his presentation; then, it shouldn't have been a problem.
If it was perceived as a gratuitous, off-color, attempt at humor; then, the subsequent response shouldn't be a problem.
The professor was responsible for properly framing the information he presented to avoid misunderstanding, especially if that information was supposed to help others avoid misunderstanding. Sounds like a case of failure to practice what you preach.
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