A clear no. Without a character attack.
A boundary describes what you will participate in and what you will do. It is not a way to control another person’s choices, and it does not require their agreement to matter.
Name your limit
Keep it specific: availability, money, personal space, or how a conversation takes place. You do not need to defend every reason behind it.
Keep the action in your control
“I’ll leave the conversation if the shouting continues” describes your action. “You are not allowed to be angry” tries to control someone else’s feelings.
Leave out the punishment
Choose a next step that protects your limit, not one designed to make the other person feel bad.
Keep the wording steady
You can repeat a short boundary rather than finding a new argument for it each time. Clear does not have to become louder.
“If you cared about me, you would stop asking.”Another way to say it
“I’m not able to lend money. I understand that is disappointing, but my answer is still no.”
Your limit. Your action. No threat required.
An example is not a script you have to follow. Adapt it to what is true for you. Clearer wording cannot guarantee a particular response.