the joke seems to be Kanako behaving like an oji-san.
Hey, have the salad! Go on!C'mon, eat up! Pack it in!Eat up!They won a lottery, so they're splurging by going out to a family restaurant.Thank you very much.Hey, we got these fries, too!They're great with lemon on 'em! Here!Still Very Much a GirlC'mon, Sanae, have some of this too! It's good!There's salad, too! Have some salad, go on!Suwako, have some meat, go on! It's great!Uh, yeah.Hey, there's pasta! Have some pasta!SpritzzzWah!Please let me eat in peace!What are you, some old man treating his juniors...?Uh...yes.Well, if you're thirsty, go to the fountain drink bar! Drink bar!