I don't really get the level of fury tbh. If she, or any other, journo had outed him - as in named him or directed people to his twitter when he hadn't tweeted anything about it - then would agree, really grim behaviour. But he did put the tweet out himself, probably reasonable to draw attention to it and all it will have done is speed up process rather than added to it as tweet would have got to wide audience sooner or later. Arguably her 'labour activist' tweet worse but then it's the first thing in his bio so again actual effect is just to get it out there quicker without increasing volume (or 'amplifying' but I hate that term).
Find level of vitriol for Kuensberg weird, I mean I'm not a fan I'm ambivalent but far more contemptible journos out there