I found the Whites pretty entertaining characters. They are textbook Trump supporters, but that made them funny in that very few shows accurately captured these people, and I liked the 'we've been here from the beginning and always get ignored 'joke which Jason helped justify. It was easy to envision them showing up well outside that episode in other roles as more than just Trump supporters, but as that always ignored family with shitty opinions.
"Splatty Tomato" made me really excited to see them again and I thought they'd add some more life to the PTA scenes where the parents mostly say the same things, or to see how Jason felt about them, which is part of why I was disappointed how they handled their next appearance. They waited a long time to bring them back and it's a little unfortunate because they only doubled down on the Trump aspect close to the end of his initial presidency, and in a much less funny way. Maybe they feel overused to people now because of the subsequent episodes.
They had a lot of potential that just wasn't used.