Getting the information from the source is a good thing. But I think he was referring to your unnecessary rudeness with the support rep. Treating other people like you would like to be treated yourself is also something grown ups do.
I was referring to his unnecessary rudeness in part for sure.
Actually it's called "getting it straight from the horse's mouth" instead of mindless internet chatter and baseless rumors. It's what grownups do.
The problem is that is not what you did. A customer support rep is an entry level employee who may or may not live in the same COUNTRY as the development team. They have like... an internal website that they read from on how to answer questions like "My phone stopped working, can you send me another one?". If you ask them a question off that script, they're probably just looking at the company's normal public website or Googling the answer for you.
The most incorrect rumors and false information have come from people who assume customer support reps are some sort of sagely information portals. You did something worse than mindless internet chatter. You created new mindless internet chatter, based on your own lack of understanding what you were doing.
Even if, for some crazy reason, that customer support rep DID know more about the update's progress, they couldn't tell you. Because generally random employees of a company are not allowed to announce things ahead of the official press release or announcement. If you were a 'grownup' and had held a job, it's likely you would know this is the case.