It is sad that you are making these assumptions on a conversation you had with one person 20 years ago. How else would you describe it? If not sad, maybe you prefer "It is not supported by the facts that you are making these assumptions...
." Maybe you prefer, "It is incomplete that you are making these assumptions..." I feel bad for you, that is why I said "sad."
Are you not an old guy now? 20 years is a long time ago. Maybe 40 is the new 20 for you.
And it is very possible that your memory isn't as sharp as it once was. Look at the evidence in this thread. You don't remember what everyone just said. And moreover, you can't even remember to answer one question...
1. What do the locals in Taiwan call the standard language that is spoken and written everywhere (TV, restaurants, schools, etc)? Chinese, Taiwanese, or "Taiwanese Mandarin."