Qualifying 125k as upper class is indicative of a gross misunderstanding of capitalism and wealth concentration. Upper class are business owners, old money heirs, celebrities and the like who find it odd that other people go into work 9-5 for 40 hours of their lives for 40 years. They are less than 1 percent of the population and have incomes from investments of generally over 500k/year and net worths of 10 million+.
This is a much more accurate description of the various levels of upper class from Economist Felix Dennis:
$2-4 million: The comfortable poor
$4-10 million: The comfortably off
$10-30 million: The comfortably wealthy
$30-80 million: The lesser rich
$80-150 million: The comfortably rich
$150-200 million: The rich
$200-400 million: The seriously rich
$400-800 million: The truly rich
$800 million - $1.998 billion: The filthy rich
$1.998 billion and Above: The super rich