In a tense situation, the nervous system first assesses safety. It is not always convenient or possible to argue immediately: the person opposite may be a manager, a loved one or someone on whom you depend. Sometimes the mind chooses to freeze, smooth over the situation or postpone the reaction until a safer moment.
Emotions also do not always turn into words immediately. At first, there may only be physical tension, heaviness or a desire to end the conversation quickly. Later, the mind assembles the details and realises that a boundary was crossed, a request ignored or a joke was not funny at all.
Delayed anger does not make the feeling invalid. But it also does not require you to return immediately and begin a second round of the conflict.
You can first name precisely what happened and what you would want next time. Then the conversation can be about more than anger - it can clarify a boundary that needs to be recognised.
The stars speak. You decide.