I've had a LOT of infected beers. no, seriously. I have. None recently though. Thank God! But, when I get that white webbing that has little bubbles forming on the surface that looks like white pond scum I have always attributed that to acetobacter. Others have corrected me and told me that acetobacter never travels alone. Fine. But that's not my point. And, yes, when you rack the "snotty bubbles" (I just love saying that) stick to the side. The only time(s) I have gotten this is when the beer was open to oxygen .... dry air lock, no airlock, buckets that went too long, and once when I added oak chips.
Unlike denny, once I get it in my head that the beer is unintentionally infected I can't enjoy it no matter what it tastes like, because to me it just tastes bad. even when others say they enjoy it.