Long Distance
You reply that their text that night was somewhat ambiguous to you and in the future you would like more context behind their texts. You'd prefer for them to be more deliberate about if they are understanding how you feel about the argument and would like their input about the argument as well. They share their recollection of how the argument and conversation went and why they perceived "Okay, goodnight" was an appropriate response. They felt that it was appropriate because it was late and they were tired.
Trying to emphasize with your partner, you acknowledge that it was pretty late and that you would be more considerate of their schedule next time. Because you decided to speak up about your dissatisfaction with your partner's response, you both have a better understanding of how considering one's schedule more will allow for deeper connections with one another in the future.
You've constructed a more positive path for your relationship, congrats!
Trying to emphasize with your partner, you acknowledge that it was pretty late and that you would be more considerate of their schedule next time. Because you decided to speak up about your dissatisfaction with your partner's response, you both have a better understanding of how considering one's schedule more will allow for deeper connections with one another in the future.
You've constructed a more positive path for your relationship, congrats!