I lived in the Osaka area for about a year to year and half total. I only had 2 instances of jerky people (maybe 3?). Pretty good considering I also traveled all around Kansai, Shikoku, and parts of Kyushu. I do not know much about you personally or present day Tokyo guys to be honest. Tokyo is a big city so probably just like many there are a lot more snobs or it could be how you act towards others? I had a good experience and have been back to the Kansai area many times since living there and continue to enjoy myself.
I did know about the freaking out and hoarding at the grocery stores. Panic makes people do things like that. My friends who live in the Tokyo area sent Facebook updates. That same type of stuff happens in US when a snowstorm or hurricane might be coming. Compare after an actual disaster like Katrina, and you see the real difference with the way Japanese citizens reacted.
Thank you for your reply and stay safe! (and enjoy living in Japan if you can--of course there are some jerks like everywhere, but lots of good people too)