I don't think ETH as a shit coin. But if ever eth surpassed bitcoin I see no reason quitting bitcoin. Why would I ? Surpassing bitcoin does not mean that bitcoin is useless already and I don't think it will last long. On the other hand just because eth surpass it, it is not enough reason to quit. Crypto is very unstable and we do not know what will happened next but knowing how good bitcoin is, it is possible to take its place as number one again.
Yeah ETH itself is not a shitcoin, But the was pertaining on the tokens built on Ethereum blockchain because there's a lot of scam and rugpull happening on a decentralized ecosystem, His sentence construction is just not emphasizing or I think he didn't know how a decentralized blockchain really works. There's no safe place even on Centralized blockchain like Binance Smart Chain also has a lot of this shit show.
Flipping Bitcoin is normal especially on trading so that you can catch a much better opportunity on other new coin that has a momentum. Quiting is not approriate to use in trading because at some point, you will need to enter again on Bitcoin once the market is on a bullish cycle.