Rather than stating that Mumsnet is 'very left wing' perhaps you could give some evidence to support your views.
I think it is fair to say that the majority of the posters on here are British - but not exclusively.
Our news sources are, on the whole, fairly unbiased - certainly compared to much that Americans are exposed to.
Hate is perhaps the wrong, and possibly too strong a word - but that was the posters choice. I might have used 'actively dislike, 'distrust' or 'fear' (his reelection)
I would argue that Donald Trump has tainted others' opinion of himself by his own actions that have been reported, over here, in a generally neutral manner.
We saw him speak about grabbing women - his own words.
We saw him mocking a disabled reporter.
We heard him suggesting that a demonstrator at one of his conventions be roughed up.
We saw him encouraging demonstrators to fight on Jan 6th.
We saw his behaviour towards others when building his golf course.
Of course your advice to people to make up their own minds is correct - to be widely read.
However your advice, to primarily UK residents, to look up Trump supporting sites is likely to produce more who are skeptical of him, his abilities, aims, personality - especially if Vox pops on these sites are watched.