I think Bitcoin will be affected by the news, while altcoins will be more seriously affected. The thing to pay attention to is that when Bitcoin experiences problems, altcoins will experience more problems.
So our eyes must always pay attention to the market.
of course the news of Bitcoin ETF's rejection was the main cause.
I think that's not the only reason that many people should look at it because over time a Bitcoin ETF has also been approved and the effect on Bitcoin itself has also been quite obvious to date. You can see how the price increases and corrections that arise in Bitcoin at this time are quite clear evidence that Bitcoin is always easier to get improvements in the market. Meanwhile, altcoins are just assets that follow market trends and flows, which basically don't need to be relied on as much as most people who rely on Bitcoin completely.
I understand your point and am not surprised why altcoin tend to be affected by bitcoin price changes. Bullish Bitcoin indicates the market will be bullish, followed by the altcoin market and vice versa. Bitcoin ETFs can obviously influence the market, money flowing in and out will have an impact on bitcoin's market capitalization. You can get facts based on data, this is something that has a correlation.
By the way, bitcoin is testing the $52k resistance again after a correction a few hours ago. The $51k support seems safe until today's market close, but I'm not really sure $52k will be held until the change of date.