No one can have a different opinion on a valuation from the market? It's unreasonable to challenge everyone who has a different valuation to short the stock es

No one can have a different opinion on a valuation from the market? It's unreasonable to challenge everyone who has a different valuation to short the stock especially since even the market's valuation can swing wildly from day-to-day. What's the valuation of a popular stock like Gamestop? Ask ten different analysts and they will probably give ten different valuations based on different reasonings. If no one came-up with a different valuation then everyone would just pile on index passive investing but that isn't the case and active investors usually see a different valuation from the market. TLDR: Normal for people to have different valuation from the market and weird to get so confrontational over someone having a different opinion.