You take that WAYYYYY too personally. Saying "The Transformers" and expecting people to instantly understand "G1" is ludicrous. The term is firmly implemented into the fandom so you cannot expect others to understand YOUR perceptive, your "personal reality". So if you want to be understood, just use the generally accepted terms. ¯\_(ツ)_/¯
There's also the fact that ALL the Transformers series and universes were someone's "true" Transformers and were their own FIRST. Yes, even (and ironically) the Bayformers where the "true" Transformers for a whole generation. Those kids must have found it weird to discover the "piles of boxes" that were the OG designs.
TlDr; everyone have their "true first" Transformers and it's fine. They just cannot impose it to others.
------------
By the way, I consider "G1" to be a way too general term because that's a whole freaking DECADE. Even G1 can be divided in at least 5 sublines:
1) "TRUE G1": Pre-Movie, where the Transformers were just "best of" multiple Japanese brands.
2) 1986 Movie: Where truly ORIGINAL "pure" Transformers appeared for the first time.
3) Post 1986: Toys that appeared after the movie.
4) Japan only: Toys that were for the Japanese continuity that remains only in Japan.
5) Pre-G2: Went until the early 1990's with many toys being just weird with odd colors notably the Action Masters and so many European exclusives.
So, personally, when someone use the "G1" term, I always wonder "WHICH G1?"