Sadly for you, the guy's actually RIGHT! The distinctions he makes are completely valid and widely accepted among people WHAT ACTUALLY KNOW WHAT THEY'RE TALKING ABOUT.
You can "hate the terminology of this hobby" all you want, just as you can hate your boss, or anyone else who's your superior in life. Thing is, that doesn't change the fact that it's the vernacular of your hobby, or profession. It just IS. Get over it.
You can try to shout a more knowledgeable member down, but you can never put down SUPERIOR KNOWLEDGE.
Take some good advice, BACK OFF.
Let me try and put this in a more peaceful way.
You may not like the language of a country you love to vacation in, but the fact of the matter is, that's the language of that country. It's the same with hobbies. We may not like the specifics of how the existing hobbyists communicate, but at the end of the day, it's a tried and true method that's worked for them, and the industry, for YEARS.
It's best to learn it and work within it, than to fight it and be left out.
Just sayin'.