i don't care
This is so simple even a blind goat could figure it out. If you still don't get it, you're either dumb or you're trying to annoy me. Either way, I'm still not caring.
You: Why did you miss class? Me: I don't care. You: Why? Me: Because I'm still not caring.
DM from my friend: Why are you late? Me: I don't care. You: But it's your birthday! Me: Still not caring.
Teacher: Why didn't you do your homework? Me: I don't care. Teacher: Are you even alive? Me: Still not caring.