Personally I don't subscribe to the "something's wrong so someone owes me free stuff" theory of microbrew purchase - the risk of getting an off bottle sorta goes with the territory. There are plenty of huge breweries with excellent quality control; choosing to not go that route has its own risks (and rewards.)
I am not saying if i someday come across a bad beer, Not personal taste bad, but quality bad. That i am going to be looking for a free handout.
What i am getting at, In the retail store that i work at, We want the customer to be happy and satisfied. If it costs the business a little bit of cash to do so...Fine.
But if that customer is happy, They will hopefully return to buy more goods from us and hopefully they will tell there freinds the problem they had with a product, and we made it right.
I guess what i am trying to get at here, A happy customer is always the best business practice any company can do, Even if it costs you a little bit of $$$
IF the brewer would have said, I am sorry for the quality control issue we had a filtering issue that day and it looks like it might be starting to show.
Is there anything i can do to make it right with you? I know you spent some cash to buy that bottle, and its not where it should have been in quality.
Something like that would have made a customer happy, But give the customer the option asking for a coupon or something....
Bad reputation can spread..... Keeping a good reputation at times is not easy, But worth it in the long run.