Nothing definite anywhere. Best I can find:
http://www.glbtq.com...opic.php?t=1294 Some other sources say the word bulldyke is as old as the word dyke or precedes it, which is interesting.
As with all words that have been "reclaimed", it's pretty much a matter of who uses it and how. Context context context.
I don't think the word is always negative. In fact when I first read the thread title, not realizing it referred to that article, I thought someone was trying to summon the lesbian contingent of Cycle Chat members (is there one?) for a pleasant all-lesbian Sunday ride...
Even though Gill is a bit of a cock, I'm not sure he meant to denigrate her for her sexuality. (He was just trying to be funny and wasn't, as usual.) I'm not even sure she is genuinely offended herself. But she seems to take issue with the word on behalf of other people in other situations. Which is weird. Not sure she is in the position to do that. Of course the word can be an insult in the playground or a threat in some dark backalley, but Gill neither screamed it at her in the playground while pushing her face into the snow or as part of a threat to beat her up. He used it in a largely descriptive way, childishly attracted to the rhyme with bike...
That said, there was other stuff in the article I found offensive.
And then again, Balding got people to discuss the issue, which is good and helps us to know where we stand as a society on gay equality.