In context, you yourself, (no PC bleeding-heart) label it 'patronising sexist' - so you could comfortably add a few notches onto that in trying to judge how the more enlightened (
) might view it.
Football as an environment is blatantly and obviously sexist (eg so many posts in this thread) - as a working environment there is no real reason to expect any better. Automatic assumptions that women cannot know anything about football (shared by most on the terraces we are told) just is a demeaning sexist view. Dismissing legitimate concerns about that sexism
in a 'there, there, don't worry your little head about that you poor confused female' manner is a real exemplar for the entrenched nature of the problem.
Since Keys' remark wasn't in any sense 'required', I would certainly label it
gratuitous - and it's blatantly a
sexist view being expressed, whilst attempting to deny its very existence.
So: 'gratuitous' & 'sexist' sound like good descriptions tbh.