Nope. It's Mike flinging Elly's stupidity in Lizzie's face.
Panel 1: As John reads his paper, Mike tells him about what he got at the Handy Haven for back-to-school: he got a Batman pencil case an' Spider-Man pencils.
Panel 2: He also got a ruler an' tape an' scissors an' notebooks an' crayons an' erasers an' glue.
Panel 3: He also got construction paper in all different colors. Instead of telling Mike that he needs a cartoonist who doesn't wield words like an', hafta and stoopid as a club to beat those she looks down on over the head, John gushes that this is just like Christmas. Lizzie says "Yah!"
Panel 4: Mike starts to laugh the Sticky-Out Tongue Laugh of Malice when he reminds a gobsmacked Lizzie she didn't get anything.
Summary: That's because dumb-ass Elly took them shopping and didn't buy Lizzie a thing because she wasn't going to school. I'm not a parent and don't plan to be one any time soon and even I know that that's bullshit; not only did Elly set Mike up to be "better", she also ruined any chance Liz might have to look forward to actual school. Worse still, she'll defend her idiocy to the end because not only is she low-class, she's as literal-minded as the snotty little child she'll always be. I know this because I have met people like her before; the more you try to convince her that she should have gotten Lizzie something nice, the more she resists.