They can't stand the idea of possibly being "tricked" by someone who used to be a man. Hell, this transphobic dips*** developer says it right in his first message there, when he went off on his unhinged rant about Keffals.
Can't say I blame them about hating Keffals. They're the same person who:
admitted to mailing minors home made hormones, for injection, and encouraging them to not tell their parents about it (Implying they know it's wrong). Going so far as to say "I'm going to put as many minors on HRT as possible, and there's nothing anyone can do about it, if you call me a groomer it only makes me want to go harder!"
advocated swatting on numerous occasions, but now that it was done to her it's a problem.
lies all the time, like saying she "woke up with a gun to her face" and the police referred to her by her birth name. Which was proven false later as no officer present had done so, and the last instance of such an occurrence was years ago on her rap sheet.
flirted with children and, as mentioned above, sent them uncertified hormones (Word of warning: don't look at the screenshots from her server, or visit her server if you value childrens' wellbeing)
has a track record of being remarkably awful to smaller trans creators, so much so that members of the trans community have issues with how she conducts herself (Crybully, "it's alright until it happens to me", etc.)