Why are men such jerks?

My husband's ex called this am to say she was "attending a benefit" and couldn't meet us at the usual halfway point to pick up her son (my stepson who visits every weekend). She wants us to drive the full 60 miles to bring him home. I say that is fine as long as she drives all the way to our house to drop him off next weekend. Is that fair? And I also think she should have had the decency to mention this on Friday night when we picked my stepson up. Am I being petty or fair? And, please, no one state anything ugly or nasty- you don't know the full details of all the bs we go through with his ex.