That sounds like exaggeration. How can you prove that most spoken language is interpreted identically among individuals? The current political landscape suggests that people will disagree over all kinds of different words and what they mean. On this very site, there have been conflicting views on what words mean, ranging from socialism, toxic masculinity, and various slurs.
This idea that language has an objective basis is not at all accepted by most people. If language did have universal meaning, then all these arts majors, like the journalists, philosophers, historians, and literature analysts, would not be viewed so negatively since there would actually be objectivity in their work. However, that's widely understood not to be the case, so please enlighten me how you came to your view that it is.
As for this idea that his joke was the cause of her reaction, his joke was not nearly as abrasive as him grabbing her breast. If a man made a similar joke, or groped your junk, which would get the bigger reaction from you?