User blog comment:Gumball2/The "Sister"/@comment-31802240-20170708004745/@comment-4618045-20170708005044

You're right. Those things don't seem all that embarrassing on their own. But they got mad for two reasons

1) Everything I said above

2) The writers really wanted Lincoln to be in the wrong for this and having two sisters be indifferent wouldn't have had the same impact.