He could just laugh it off if it was all in good fun. Sometimes, showing that you don't take it too seriously can defuse the situation and keep things light - hearted.
The novel provides a vivid account of a young boy's experiences during the Pearl Harbor attack, showing his fear, courage, and growth in the face of war.
A perfect boy in such a situation would be resourceful. He'd use whatever is at hand to solve the problem. If he's lost in the woods in a story, he might make a shelter from branches and leaves. He'd also be selfless, putting others' safety before his own. He'd make sure the weaker ones are protected and taken care of first.
Their friends would likely be a mix of shocked and excited. Raven, being the more reserved one, might initially be a bit concerned about how this will change their dynamic as a team. But she would also offer her support in her own quiet way. Cyborg would probably be the most excited, already thinking about building all sorts of baby - related gadgets. Starfire would be overjoyed and would immediately start planning baby showers and knitting baby clothes. Robin would be more practical, thinking about security measures to protect Terra during the pregnancy and the new family once the baby arrives.
Some people might immediately side with the girl, especially if they find out the boy was in the wrong first. For example, if he was the one who started the trouble by being aggressive.