Carlos, Stop letting her ruin your day. Be politely persistent in what the agreement is. (is this a legal agreement?) Make sure you are holding up your side and document her actions. What's the expression here? Oh yeah, don't try to apply logic to the illogical.
Don't let her tell you what you think - you like one son more than another. Every time she tries it, you need to correct it. That's a healthy boundary. Let her know you will communicate with her in the mode you deem best for the situation. If she has a question then it is her responsibility to get a answer and sometimes "no" will be the answer.
Spend your energy on yourself and the boys.

Smiley had a short thread about the Atlantic article. Maybe you could use your talents to write about your perspective on divorce?

Cheers

M22,H45,W45 S21/18D12
Retain faith that you will prevail in the end, regardless of the difficulties and at the same time confront the most brutal facts of your current reality, whatever they might be.