If your T didn't care at all, then they would ignore any signs and statements you would make that lean towards putting you at risk of harming yourself or others.

He's addressing it and trying to get you help, even if it isn't the way that you want it addressed or helped.

You said in your first message that you let him know about things you are doing that counts as self-harm. Which means that you're already doing it, and it's not just "thinking" about it. Which makes his response have to be different - he has to take action and get you the help that you need.