Gabe, I didn't read anything good in that or at least not much. It sounded like the "not available on Friday" is a cut to me...like "you know you have no life". I think she expected an okay from you and when she didn't get it she got snappy. But I could have misinterpreted. I personally think you should have gladly accepted the increased time and shown that you can easily be Mr. Mom. She's struggling apparently with being Mrs Mom. It would also have shown the level of commitment to your son. Although it already sounds like a ton of time you get. Just realize that she'll never find anyone out there that loves your son...not like a dad.
And it sounds like she really didn't take the inquisition well. Obviously inquiring minds would like to know if her reasons are to increase availability for dating or if she just needs more down time. I agree with UD that after a while without your son she'll start to feel lonely. Hopefully that's not easily filled with dates. It hasn't for my ex yet as far as I know.
In the end, it's not the years in your life that count. It's the life in your years. Abraham Lincoln
It is hard to fail, but it is worse never to have tried to succeed. Theodore Roosevelt
