Seriously, though, do you think being a mum is sometimes about having to be nice and lovely all the time, and due to that it makes mums have an inner anger...perhaps.
I am a mum. I am also a human being, same as the next person. Becoming a mum did not give me an instant personality change into some mythical image of what some people think a mum should be like.
In fact, I don't actually consider myself particularly maternal, tbh. My DCs are well cared for both emotionally and physically, we have a lot of fun. But maternal? Nah.
And I don't subscribe to some people's ideas of having to act in a certain way just because I had 2 children.