Not all opinions move the conversation forward or reflect well on the speaker, particularly uninformed opinions.
Disagreement, contradiction and derailing are the opposite of friendly conversation & good-faith engagement.
Before you rush to disagree, you might consider the identity of the speaker, the original context of the quote, the context of the conversation it's quoted in, the intentions behind both.
It's okay to pause and think.
It's okay to have a thought and not share it.