What is the smallest amount of money hedge funds care about when monitoring order flow?

I'm trying to settle a debate with a friend. He claims small hedge funds are watching his 50,000 dollar penny stock orders and shorting the stock in order to steal his equity. When looking at the amount of money hedge funds manage this seems like a drop in the bucket.

I personally don't think hedge funds have much interest in penny stocks period. Could a small hedge fund take a short position in a penny stock with a relatively large market cap and float. Sure.

But I think even a small fund has no interest in an countering an order less than IDK a million dollars? I have no idea what the threshold is which is why I am asking lol

Thanks in advance for humoring someone who is still a beginner with the market.