Define I Just Can't Meaning

person 1: Walk straight into a wall
person 2: *facepalm* I just can't... I just can't with you anymore.

I just can't Trump today.

1. Lis: Look at that Guy wearing a Banana suit.
Lauren: Oh wow, I just really can't.

2. Makayla: Do you like my new Yellow Weave?
Jaclyn: Hell no, I just really can't.

3. Nicole: I just found out that you're Boyfriend cheated on you.
Thaddeus: I just really can't.

4. Steph: So I'm pissed? I just really can't.