I believe this self-righteous attitude regarding acquisitions comes from being a bootstrapped startup. When you bootstrap your company starts with a valuation of zero. The only way to increase your company's valuation is to start making a profit. For the bootstrapped guys an acquisition offer means that your company has grown to the point where competitors feel threatened. When you are in this position the only reason to sell is if your company is no longer growing (why sell now when your company will be worth more next year?). That is a tragic situation.
The founders who raise money start with an expected valuation greater than zero. Usually these guys can sell well before they ever meet the expected valuation. I mean shit, the startup SocialThing! sold to AOL for $7 million while they were in private beta. In other situations these companies fail to meet the expected valuation and have to sell in order to protect the reputation of the investors and founders. For example Slide sold to Google for $183 million. My company Quiz Monster (bootstrapped) is a competitor to Slide, has a larger userbase, and is worth $1.5 million at best.
TL;DR: Bootstrapped companies have to work harder than venture backed companies in order to receive acquisition offers and thus feel very self-righteous.