to the others who are trying to bully her into being quiet or changing who she is at her core
There is some very selective reading going on. A blindness to the blatant mirroring of derogative terms used to describe people in a (highly relevant to the thread) context, combined with employing to the letter the precise advice that the OP has been giving.
"People giving you crap and walking all over you" is subjective and will depend entirely on the recipients' perception of being labelled and told they are doing it wrong, by somebody who has not engaged on any level with the very real barriers people struggle with when it comes to exit/disengagement strategies.
It is rather "do as I say, not do as I do, when I think you should, but not when you think you should if that doesn't suit me" to exhort people to "man up" in the face of somebody putting them down or making them feel bad, and then paint as bullying the responses of people reacting to indirect, (mumsnet talk guidelines obeying) insults like wet blankets, doormats, whimpering, thick and "new" used as a dismissive device, when they do just that.
I think the ability to respond robustly has surprised some because there is a tendency to see people stuck in unhappy situations and assume that their incapacity to extricate themselves swiftly and definitively is due to an inherent lack of personality on their part.
However it is not a given that finding it hard to navigate a specific dysfunctional relationship means they are therefore wholly devoid of the capacity to defend themselves and incapable of refusing to stand by in silence when publicly characterised in negative terms by any poster that feels like doing so.
Perhaps demonstrating not quite the wholesale easy target they are sometimes assumed to be ?
I feel no need to change who Tee is at her core. Who she is is her choice and responsibility, not mine. I very much doubt you can know (let alone change) the whole sum total of a person from a single thread on an anonymous internet forum anyway. I'd be taken aback if anybody else posting here felt differently in that regard.
However that does not translate as my (or anybody else) feeling obliged to providing her with an uninhibited opportunity to stick her labels of choice on people, like myself, still reeling from the latest festive fucked up family encounter.