Suffice it to say that I would recommend that someone who is a junior engineer and new to any company _not_ try to tell everyone on a company-wide engineering list that he or she knows more than the all of the other engineers in the company, and to not try to claim that he or she has superior technical vision, such that ignoring all of the engineering tradeoffs and to just do things His way is the right way to go --- and that anyone who doesn't see things his way is a total idiot.
Furthermore, in general, it's a bad idea not to make yourself look like a total ass in public; it's a career limiting move in most companies, but in a company where it is truly the case that your peers have a lot more to do with your getting promoted than what your manager might have to say, it really, Really is a bad idea.
Hopefully everyone would agree that this is good advice....
And if you join an engineering company where the engineers pride themselves on data and accomplishments rather than speculations, it may be worthwhile to provide evidence to support your theory than just argue with everyone without anything to it up.
And if you join a company and someone more senior than you with ACTUAL accomplishments and that is respected in and outside of the company tries to take you under his wings and guide you through the corporate landscape, don't dismiss their actual accomplishments as "irrelevant" at the same time boasting about your success in a product for a "niche market that doesn't exist"
And if you join a company, you should not claim expertise in something unless you are an ACTUAL expert and have the knowledge, experience, and accomplishments to back that up. Saying that you're a T7-9 visionary doesn't make you a T7-9 visionary!
And if you join a company, don't dismiss your fellow colleagues and make a fool of yourself because even if you don't work with them now at the current company, you may encounter them again in the future.
I'm not speaking to any specific incident. Just general advice that any new junior employee to any company should follow.
For people skeptical of the other replies here, the reputation of OP is pretty well known... it has almost become a shibboleth of the people that were around during his tenure.
There's a huge, internal backstory to mchurch at Google. Most of which I don't have the right to share with the public. Most Googlers' responses here are based on that. That's why there is a visible disconnect in their heated responses to mchurch here when viewed from the outside.
As for the "California" thingy, he can't tell anything wrong about any state?