Defending women's rights is not "anti trans". There are a small, but vocal minority who feel that anything other than unquestioning acceptance means that you are a bigot.
In the majority of cases women are simply trying to come together to talk about how they feel about proposed changes, whether this presents an issue for single-sex services and rights. In return they have been intimidated, shouted down, heckled, subjected to relentless campaigns to get them sacked, dragged through the courts and in some cases physically attacked.
In relation to Upfield's decision to sever ties with Mumsnet - I'd have more respect for their decision if I thought it was genuinely motivated. But given the fact that they have waited to announce their change in policy after they've obtained a load of review data on their new product from willing MNers, suggests to me that this is nothing more than virtue signalling done on the cheap.
Upfield is also missing the point that women are incredibly influential in domestic purchasing decisions. If they were to walk to an average high street, say in Doncaster, and ask shoppers there if they thought that women have penises, they'd be met with disbelief and laughter.