You are wrong. Have you checked the market currently?
Bitcoin price should influence altcoin prices. And it was proven till now. I saw many altcoins increased after Bitcoin could reach its new highest value this year. I monitored the improvement for weeks and even months. But when the Bitcoin increased, it sometimes didn't bring influences to altcoin's values directly. It needs time to show the impacts.
Ignore stable coins like USDT. They don't depend on Bitcoin.