What would you do

Me and my husband were getting our 3 year old son ready for bed and I didn't feel like reading tonight and said "I'm not as enthusiastic and good of a reader as you, you should read to him tonight." So my husband says in an annoyingly normal voice, "well clearly you don't care about his education since you don't care to be enthusiastic while reading OR read to him." (We take turns reading every night.) And of course, I got offended and said "how dare you say I don't care about our sons education because I don't feel like reading TONIGHT." Then he looked at our son and said "that's okay, clearly mama doesn't care enough about your education to read a book to you." And he picked up a book and ENTHUSIASTICALLY started  reading as I walked out tearing up and in shock, trying to keep calm because I'm pregnant. 
Am I being overly dramatic about this because of my hormones or was this wrong and rude of my husband?
If I'm not being overly dramatic, how should I handle the situation?