What are you talking about, "It's a must..."? What is this "corporate world" that you refer to that requires you to blow your horn in order to advance?
If it's "just not in our culture" what's your concern? Is this "corporate world" that you wish to advance in some culture other than "our culture"?
Have you considered that maybe your cringe impulse and your adversity to bragging are positive character traits?
Incidentally, all the Asian immigrants that I happen to know are polite, considerate people. I don't happen to know any Asian immigrant gang bangers - do they blow their horns a lot?
I could be wrong, but I believe that in California it is against the law to use the horn for anything but an emergency or legitimate warning, like waking someone up who sits at a traffic light after it turns green (I use an auxiliary diesel air horn for that). Sounds reasonable enough to me - keeps down noise pollution, no?
I had an idiot neighbor once who left for work at 6:00 a.m. every morning, would back out of his driveway, then toot his horn twice at his idiot wife who stood at their front door waving goodbye to the moron.
I felt like strangling both of them after several months
but, fortunately for all concerned, they moved before I snapped.
Your question's a joke, right
? (it's very late - or very early; depends on how you look at it
.............).