I would say that what is fine is robust debate. If you said something like, that you think the Suella Braverman's approach to migration is cruel because <insert reasons>, that would be robust debate. But calling her 'Cruella' isn't robust debate - it's simply name-calling.
I would be wary of those kinds of judgements. Yes Braverman has a job that is powerful in the sense of being able to have a lot of influence on many people's lives. And you could also argue that she has chosen a career in which a lot of criticism is expected: She made that choice freely so she should expect to have a thick skin. But on the other hand, being powerful doesn't necessarily mean a person might not be struggling mentally or in some other way that you don't know about. If you want a compassionate society, which I think from your posts that you do, then you have to remember that compassion applies to
Maybe that's because almost no-one on the threads that I read uses insulting nicknames and other abuse against politicians on the centre or the left? Whereas in these railforums threads I very regularly see abuse directed against right-wing politicians - often not just by one person, but with the abuse then repeated by multiple other posters.
To be clear, I regard abuse as wrong, no matter who it's directed at or what side of the debate they are on. But it's very clear to me that there is a particular problem on the left, where people on the left - including even senior politicians - seem to think that it's OK and culturally acceptable to abuse people on the right (remember Angela Rayner's 'Tory Scum' speech? Could you even imagine a senior Tory politician today making a speech declaring that Labour people are scum? It just wouldn't happen because - at least in the UK - that culture where abuse of opponents is considered socially acceptable simply isn't there in mainstream politics on the right.).