what to do if someone doesn't understand mental illness

if i apologize and their reaction is all "excuses, excuses", do i just go , its not an excuse, its an explanation, or just let them think that way and apologize anyways? or what if they dont care what mental illness you have, they dont wanna hear it, should i finish wit h an apology(preferably through call) or just leave them alone?

edit: hypothetical

edit: psychosis/mania do not compare to adhd