He says work is more important, am I overreacting?

Knorr

I told my ex he needed to make more of an effort to come to our sons doctors appointments. Our son is 1 and has optic nerve hypoplasia (ONH) which affects his eyes, pituitary gland and possibly other parts of his brain. My ex hasn't come to a single appointment because he always says he works, I tell him about these appointments months in advance but today he told me that work is more of a priority and he doesn't want to take any days off due to his reliable reputation at work. Am I unreasonable for being mad at him for this?