I suppose that the question of... I think "standpoint epistemology" is the accepted name for it, but that feels really wanky, so I suppose you could call it a standpoint approach, or indeed a context, perspective or experience approach, is a big question and one that's hard to settle. It's one of the big questions animating the 100-page identity politics thread, and it comes up in a lot of other things, for instance the saga of Jeremy Corbyn and the Wrong Kind of Jews is also one where questions of standpoint and who does or doesn't get to speak for a particular perspective keeps coming up.
Like, of course you can't use a "hard" standpoint approach, cos, for instance, it's not possible to agree with equationgirl, Elizabeth and Daphne at the same time. But at the same time, trying to make a hard anti-standpoint argument, and always ignore the speakers' identity or experience, is obviously rubbish as well, we all draw on context in making judgements all the time and standpoint stuff is one part of that. I don't have a neat conclusion to this, I think it's just one of those things that's messy and complicated.
I suppose what baffles me about the Equity Punks Defence Squad argument here is that it seems to rely on a different kind of anti-context argument. If we see something ambiguous, like, say, a piece of marketing that could be offensively sexist or could be totally innocent (if anyone's still making that claim? Hard to keep track), we would usually rely on context to try and resolve the ambiguity: for instance, if the potentially offensive piece of marketing came from an institution with a track record of offensive arseholery, that would probably be enough to settle it for me in terms of not wanting to give them the benefit of the doubt. But it seems like everyone accepts that Brewdog does have that track record, but some people are unwilling to bear that context in mind when judging anything else they do? Seems odd to me.