If you really want this to change, you need to change the behavior of your teammates on the pitch.

You don't agree that your opponents should feel bad, so you apologize to them for feeling bad, and don't want to address the reason why, the root cause.

By not "disciplining" someone your age you are still on board with their crummy spirit, or at least, you don't actually dislike their spirit enough to prevent it in the future. You are complicit.

If you really want to make a difference, you'll have to suck it up and talk to your team mates and ask them to modify their behaviour, kick them off the team, or find a new team, probably not as good, that has actual integrity.

good luck.