I think some people just aren’t looking for a answer, they just want to bitch.

This is most often when there’s nothing wrong with the way you’ve done something, it’s just not the way they do it.

I think this person asking you is really trying to tell you you did something the wrong way, but in a less direct manner, because directness is considered "rude" in some cultures.

The mistake here is that the person explaining is interested in things like being correct or promoting efficiency while the adversary is only interested in hierarchy and dominating the explainer within their social context. That's the miscommunication happening.

A reason is an explanation although not all explanations are reasonable.

An excuse is an attempt to justify a reason/explanation.

Excuses are used when the expiation is not reasonable.

A reason is a motivation to do a thing. An excuse is a reason to do the wrong thing (though not necessarily an inherently wrong thing - just anything that the other person thinks was wrong).

excuses lend themselves to lengthy explanations. reasons are more succinct and pertinent

More often than not it's more appropriate to say "I misunderstood, how should it have been done?" or "Sorry, I wasn't paying attention. I'll be more careful" which may or may not include an apology depending on whether you inconvenienced someone else.

I really dislike rhetorical questions.

(got put in wrong place. Edited and put in correct place for proper response)