Dog fooding is the best way to describe my feeling now. I'm drinking my 6th batch and my 2nd Lager attempt... An American Light (I was shooting for an Asahi Super Dry clone). Anyway, it had a sulfuric taste when I kegged it. As a Lager that's to be expected so I did the prudent thing and let it sit (and lager) for a few weeks. Now it has developed the treaded malt vinegar taste hinting towards an infection. The Sulfur smell is gone and even though it tastes like something that I should put on my fish-n-chips I'm drinking it and it's actually not terrible.
I've had plenty of successes to be happy about even a molson like lager that turned out great and my wife and I drank that batch in record time
All is not lost yet, the vinegar taste has not gotten worse over the last week so maybe I'm just experiencing green lager beer.
Suspected cause: I used my formerly pristine racking tubes for an airlock/runoff config and it got gunk in it that a starsan soak (for days) and a warm water rinse would not clean out. I used it for racking to my keg with a tiny bit of visible gunk in the tubing and I thought that would be harmless. My Molson Lager was racked with the same tubing and didn't cause any issues. Just in case I will now keep my run-off tubes separate from my racking tubes.
Another reason this is a great hobby: You get to drink your mistakes and piss them away.