The best explanation I can come up with is that those 90 min Dogfish's had TOO much flavor and now you're just having a hard time focusing on what the heck a BL actually tastes like because you're no longer tasting anything of substance....mostly cheap adjuncts like corn and rice.
TBH, I sometimes employ the same tactic when I have nice brews around but with Labbatt Blue instead of Bud. I'd much rather have 2 or 3 of the good beers live on to start the next session instead of get wasted as my 5th or 6th glass of the night.
Cheers! Down the hatch.