I think it's fine to say you like or don't like an item of clothing. It is not fine to say someone is 'tarty', suggest that she is unprofessional because she doesn't dress as you did 'in your day' or comment on the 'legitimacy' of her child.
AR has had so many horrible comments on here because she came from a council estate, has a Northern accent and a colloquial register. Like her politics, don't like them, that's fine either way. Like her clothes or don't. She is a young woman dressing as young women prefer - I certainly wouldn't have given a tinker's cuss for what 'grans' thought about my clothes at her age - that's the whole point of fashion.
Comment on what she says (as opposed to how she says it) as strongly as you would about a male politician, but calling her a tart is sexist. The word itself is sexist - there is no male equivalent. In fact it is probably libellous. What evidence is there that AR is sexually profligate? Commenting on Sunak's trainers (or MF's donkey jacket, or BJ's tatty appearance) just doesn't compare in any way, and I can't believe people don't fully recognise that.
It strikes me that there is a subset on here who are appalled that AR has power over them, and not only is she a woman (š²), but she is a woman who they have traditionally (and lazily) looked down on for not being as 'well heeled' as they think they are, and for getting pregnant at a young age.
If they judged AR on her achievements they would have to admit that by comparison their own are lacking, so they punch down and attack her appearance, accent and background. That is not only unkind and snobbish, but it is entirely mannerless as there will be women on GN who have Mancunian accents, have so-called 'illegitimate' children and who were brought up on council estates. Manners are about not making people around you feel uncomfortable.
On another thread, people are congratulating Starmer and Sunak for their decent speeches and respective grace in victory and defeat, and saying how this is a marker of a civilised country. I agree, and am genuinely shocked at some of the cheap, shallow and narrow-minded things I've read on GN recently.