It happens. But you both should be actively trying not too do that and apologize and make it up when you do.
Marriage is full of ups and downs and compromises and trying to make it work.
A metaphor that was told to me was. It's like when you put two rocks together in a bag or container. They have rough edges and they occasionally bump and scratch reach other but over time the edges become smooth as you learn to to navigate and get along with eachother. You can become comfortable. But it's like that with any relationship, the only difference is with marriage you've committed to putting the time in together.
However... each person needs to be just as giving and willing. Otherwise, if one rock is harder and less giving than the other it can end up pulverized the other.