Panel 1: We start off watching Richard swing on a swing tied to a tree branch and boast to Liz about how fun it is.
Panel 2: He then sets the tone of the strip by deliberately trying to hurt her feelings by pointing out how it's too bad SHE doesn't have a swing at her house.
Panel 3: When Liz asks him if she can have a turn on his swing, Richard says "When I'm finished."
Panel 4: A while later, she asks him again and he has the same answer.
Panel 5: When she points out that she's been waiting a long time, he again says that when he's finished, he'll let her on.
Panel 6: Having finally realized that he's never gonna let her use the swing because he's a creep, she walks off crying a little.
Panel 7: A while later, we see her on the stoop eating the right ice cream when he comes up and says "Hi, Elizabeth."
Panel 8: Since he's an entitled snot being raised by a mother even less competent than Elly, he asks her if he can have a bite of her ice cream. She says "Sure!"
Panel 9: When SHE says "When I'm finished!", he is gobsmacked.
Summary: Given one of the shorter forms of the proper name Richard, I think that the naughty little child in Lynn was hooting in glee when she contemplated telling people not to be a dick.