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Q: What is a good argument against a theist who says “something can’t come from nothing so it MUST need a creator”?

There are a variety of different counter-arguments available, depending on how sophisticated or glib you want to be:

1. We don’t actually know that “something cannot come from nothing.” It may appear to be simple common sense and it may be true that we have never observed it happening, but neither of those things means that it must be true in all cases. There are a lot of things in the natural law that defy common sense, especially when you start talking about quantum mechanics and relativity, so that is not always a good guide. Also, modern science is now claiming that “nothingness” is an inherently unstable state and that things such as “virtual particles” do, in fact, appear ‘out of nothing” all the time.
2. We don’t actually know that the universe “came from nothing” in the first place. That’s more of a theistic idea of “creation ex nihilo.” The so-called “big bang” theory describes the expansion of the universe from an initial hot and dense state, but it doesn’t say that that initial state just appeared out of nowhere. It could have existed in that state or some other state forever. Or perhaps it “budded” off another universe as part of a larger multi-verse. Or perhaps some other option we can’t even conceive of right now.
3. Even if it were absolutely true that something can’t come from nothing and therefore the universe must have a “creator” of some sort, there’s no reason to claim that this “creator” must be any sort of sentient being or any sort of “god”. A meteorite “creates” a crater when it strikes the Earth. The process of water seeping through limestone over many years “creates” stalactites and stalagmites. Both of these involve something new arising via an act of “creation,” but neither one requires an intelligent “creator.” Just as there are natural laws that govern how things work within the universe, there might very well be natural laws that govern how universes are formed in the first place.
4. If everything that exists needs a creator, why doesn’t God itself need a creator? And if you can make an exception for God because it is somehow “special”, then why not make an exception for the universe and skip God all together?

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