Wow - it's rare that I've seen tiktok getting narked like that (unless it is someone disseminating false information about bf - and even then she normally gives them the benefit of the doubt initially - while correcting them).
There is language that I use when talking amongst fellow adults (which is what other MNers are) and language that I will use in front of children. The language used on Mumsnet is, of course, the former. And if people are talking codswallop, we tend to say so - forthrightly 
. Unless you are choosing to read this out loud to your children 
, it is not going to sully the innocence of any child. This is an adult space.
Better warn NothbyNorthWest never to goodle dragon butter 
(BTW: I never have and never will. I am too scared sufficiently sensible to listen to the horrified warnings that it is not something you should do!)
I am also still not clear whether she thinks it is OK for others feed in public: it is, as others, have said, her prerogative to hide away, but I get the sense, from her comment about "grandstanding" that she thinks that we should all hide away. Would a bottle feeder also be accused of grandstanding??
I hope that either that impression was misleading and/or she has now at least given pause to the thought that some people see it as perfectly normal and don't feel the need to hide away, nor are they "grandstanding". As adults, we eat in public. Babies can do so too.