Let me try and break it down,
Discretionary income: is like a form of left over after taken care of your essential expenses ( rent, food, electricity bill etc.) , and you can choose to spend, saved or invest with it .
While Discretionary funds : money you choose to set aside for fun or for personal want and stuff , discretionary funds is from your discretionary income .
For instance my discretionary income is $500 I can choose to make use of $200 as my discretionary funds, while the remaining $400 can go into saving or investing .
You guys seems to be confused and you almost confused me too. There is no difference between discretionary funds and discretionary income rather it is just a misplacement of word in other words they are both same thing so saying discretionary funds is used for hanging out with friends and the rest is wrong not true because they are same thing just that people put discretionary funds in place of discretionary income or they mistake discretionary income to discretionary funds because generally there is nothing like discretionary funds so don't get it twisted people are referring to same thing.
No bro, you are the one that is wrong here, discretionary income and discretionary funds are two different things.
Discretionary income is that money left after all basic needs have been made, it is what's needed for consistent investment in Bitcoin, while discretionary funds is that money used to invest in Bitcoin at that particular time, but for consistent buying of Bitcoin, discretionary income is needed.