Ce que je déteste, c'est le sarcasme vulgaire.

Questions & Answers about Ce que je déteste, c'est le sarcasme vulgaire.

Why does this sentence use Ce que instead of Ce qui?
We use ce que (meaning "what" or "that which") when it acts as the direct object of the verb that follows it. Here, the subject doing the hating is je, so ce que is the object receiving the action. If "what" were the subject doing the action (for example, "What is happening?"), you would use ce qui instead.
Why is there a c' in c'est? Why can't we just say "Ce que je déteste, est..."?
In French, when you use a "Ce qui / Ce que..." structure to emphasize something, you must introduce the second half of the sentence with c'est (literally "it is"). You cannot just use the verb est on its own like we do in English ("What I hate is...").
Why do we need le before sarcasme? The English translation just says "vulgar sarcasm".
In French, you must use definite articles (le, la, les) when talking about abstract concepts, categories, or things in a general sense. Since the speaker hates vulgar sarcasm in general, rather than a specific instance of it, le is required here.
Could I just say "Je déteste le sarcasme vulgaire" instead?
Yes, absolutely! That simply means "I hate vulgar sarcasm." However, using the "Ce que... c'est..." structure adds emphasis. It strongly highlights the specific thing you hate, exactly like choosing to say "What I hate is..." in English.

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