I think you should not be redefining what words mean to make your argument.
Wealthy means to have wealth. Wealth is the abundance of financial assets. Income can become wealth if saved/invested, but it is not wealth.
There are numerous definitions of middle class, with many being "not upper, not lower". Upper class is defined as those that have the most wealth (explicitly not income) and political power.
$People with 380k of income, but without significant assets are not upper class. They would be considered upper middle class.
https://www.merriam-webster.com/dictionary/wealthy
https://en.wikipedia.org/wiki/Wealth