RE: Why it is important to protect words from redefinition...

Yeah I can relate

Once I wanted to describe someone to another person, and then I said "That fat man"

The human being cautioned me and told me I am not supposed to describe someone as fat irrespective of their body weight

So I asked, what then would I had said? He answered "Chubby"

Now, he explained that there are emotional conflicts that come with calling people fat. I think it is something called "body shaming". I don't know for sure

so when you said, we give lots of meanings to various words, I remembered this incident, and agreed that you are right