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Проблема вызвана тем, что макеты не используются в RantContainer. Также желательно установить ограничения в rant-content вместо rant-container.

class RantContainer:
    def __init__(self):
        # Bad idea to subclass widget because it breaks painting
        # i.e. the background color goes bye bye
        # I'd love to. I really would. But just no.
        container = QtWidgets.QWidget()
        container.setObjectName("rant-container")
        self.container = container

        rant_content = QtWidgets.QLabel()
        rant_content.setObjectName("rant-content")
        rant_content.setWordWrap(True)
        # rant_content.setFont(rant_font)
        self.rant_content = rant_content
        rant_content.setFixedWidth(600) # <---
        rant_content.setMinimumHeight(150) # <---

        upvote_btn = QtWidgets.QPushButton()
        upvote_btn.setObjectName("upvote-btn")
        # upvote_btn.setFont(vote_button_font)
        upvote_btn.setText("++")
        self.upvote_btn = upvote_btn

        downvote_btn = QtWidgets.QPushButton()
        downvote_btn.setObjectName("upvote-btn")
        # downvote_btn.setFont(vote_button_font)
        downvote_btn.setText("--")
        self.downvote_btn = downvote_btn

        score_label = QtWidgets.QLabel(alignment=QtCore.Qt.AlignCenter)
        score_label.setObjectName("rant-score")
        score_label.setText("69")
        # score_label.setFont(score_font)
        self.score_label = score_label

        vlay = QtWidgets.QVBoxLayout()
        vlay.addWidget(upvote_btn)
        vlay.addWidget(score_label)
        vlay.addWidget(downvote_btn)
        vlay.addStretch()

        hlay = QtWidgets.QHBoxLayout(container)
        hlay.addLayout(vlay)
        hlay.addWidget(rant_content)

QSS:

QWidget#rant-container{
    background-color: white;
}
QWidget#rant-container:hover{
    background-color: #f2f2f2;
}

Или:

class RantContainer:
    def __init__(self):
        # Bad idea to subclass widget because it breaks painting
        # i.e. the background color goes bye bye
        # I'd love to. I really would. But just no.
        container = QtWidgets.QWidget()
        container.setObjectName("rant-container")
        self.container = container

        rant_content = QtWidgets.QLabel()
        rant_content.setObjectName("rant-content")
        rant_content.setWordWrap(True)
        # rant_content.setFont(rant_font)
        self.rant_content = rant_content

        upvote_btn = QtWidgets.QPushButton()
        upvote_btn.setObjectName("upvote-btn")
        # upvote_btn.setFont(vote_button_font)
        upvote_btn.setText("++")
        self.upvote_btn = upvote_btn

        downvote_btn = QtWidgets.QPushButton()
        downvote_btn.setObjectName("upvote-btn")
        # downvote_btn.setFont(vote_button_font)
        downvote_btn.setText("--")
        self.downvote_btn = downvote_btn

        score_label = QtWidgets.QLabel(alignment=QtCore.Qt.AlignCenter)
        score_label.setObjectName("rant-score")
        score_label.setText("69")
        # score_label.setFont(score_font)
        self.score_label = score_label

        vlay = QtWidgets.QVBoxLayout()
        vlay.addWidget(upvote_btn)
        vlay.addWidget(score_label)
        vlay.addWidget(downvote_btn)
        vlay.addStretch()

        hlay = QtWidgets.QHBoxLayout(container)
        hlay.addLayout(vlay)
        hlay.addWidget(rant_content)

QSS:

QWidget#rant-container{
    background-color: white;
}
QWidget#rant-container:hover{
    background-color: #f2f2f2;
}

QWidget#rant-content{
    min-height: 180px;
    min-width: 660px;
    max-width: 660px;
}