Neither one makes much sense. Both constructions suggest that there is a widely-held belief that all men are good drivers. Leaving out the ‘it’ sounds a little folksier.

Both are easily understood, but I agree with Filip that the second is grammatically superior. The problem with the first sentence is that it treats "just because he's a man" as if it were a noun phrase, but it is not one. "Because" does not create noun phrases the way a word like "that" can: "That he's a man doesn't mean he's a good driver." (good sentence) Here are some other ways to create the noun phrase you need to make sentence #1 work: "Just being a man doesn't mean he's a good driver" "Just that he's a man doesn't mean he's a good driver" "Just the fact that he's a man doesn't mean he's a good driver" "The fact alone that he's a man doesn't mean he's a good driver"

Both sentences are grammatically correct, but the second one—"Just because he's a man, it doesn't mean he's a good driver."—sounds more natural. Here's why: Explanation: 1. Clarity and grammar: The phrase "it doesn't mean" includes the pronoun "it," which acts as the subject of the second clause. This makes the sentence clearer and more formally constructed. 2. Common usage: In English, especially in more polished writing or speech, including the pronoun "it" aligns better with standard grammar rules. 3. Flow: The first version omits "it," which makes it sound more casual and conversational, but it can feel slightly incomplete in some contexts. Tip: Use the second version ("Just because he's a man, it doesn't mean he's a good driver") in formal or professional settings. The first version is fine for casual conversations, as shorter phrasing often feels more relaxed.

First one!