Panel 1: We start with Dainty Doll-boy Mike pulling at one of Lizzie's socks.
Panel 2: He smiles with demented glee when his pulling on the second makes her fall backwards and hit her head.
Panel 3: He laughs a sticky-out tongue laugh of malice because, having tied her socks together, she cannot move and thus has the cloud of anger over her head.
Panel 4: To his consternation, she removes her socks; the reason why becomes obvious as he thought-bubbles "Darn..."
Panel 5: "...I thought she was wearing tights!!"; five bucks says that his feeling of frustration will be replaced with feelings of persecution.
Summary: That's because the dumb bastard will soon get yelled at by Elly for being evil; it's not about his being bored or feeling shorted because he's been asked to be a two-year old's primary caregiver so his mother can scrub the attic, watch soaps and gossip, it's about his being an evil boy who needs to be shoved off a bridge.