Michael,
I'm sorry you ran into this issue. There are multiple considerations that go into the color choices of our maps and layers, color-blindness being one of them. With that being said, there are different types of color-blindness and unfortunately we can't account for all of them. I reported your feedback to the appropriate team and they will look into improving the colors for future updates.
Thank you,
Tamara
Tamara Grant | ArcGIS Living Atlas of the World
Esri | 380 New York Street | Redlands, CA 92373 | USA
Work 909-793-2853, ext. 5028 | Cell 814-442-0579 | tgrant@esri.com | www.esri.com