Why don’t you respond to disrespect as you get older

(1)In my 20s, when I’m rude, I fight back. In my 30s
(2)I tried to explain why you were rude, but I haven’t answered back since I was in my 40s
(3)In my 20s, I thought that disrespect was due to personality, and in my 30s, I thought it was a cultural difference, but now I know that disrespect is due to ignorance and low self-esteem