money for discretionary spending is not the same as disposable income.
https://www.investopedia.com/terms/d/disposableincome.asp defines disposable income as net income, that means after taxes but before living expenses.
https://www.investopedia.com/insights/americas-slowly-disapp... defines middle class in the US as a disposable income from 35k to 106k a year.
if you spend all your discretionary money on going out with your friends and not on any other hobbies, traveling, gifts, etc, then maybe you can spend $100 every weekend afternoon.