I do not doubt that there are transphobes out there, just as there are homophobes, misogynists, misandrists, and racists.
I don't spend much time trawling her Twitter feed but it appears Joanna Cherry objects to the poisonous atmosphere in the LGBTQ+ campaigning community in recent years, and in particular the vitriol directed at those defending women's sex based rights, and their labelling by others variously as TERFs, transphobes, etc.
There ought to be a more honest debate about where the boundaries are in one person's rights potentially infringing another's. Instead we have various actors attempting to shut down any debate at all, making accusations in order to silence others, or forcing them to pick a side in a trench warfare mentality.