The fasces are a symbol of ancient Rome and the swastika is a Hindu symbol and collecting badges from a jam manufacturer is harmless and I don't see colour and blah blah fucking blah.
There are lots of insults we don't tend to use in the UK. We don't call a man a jerk, or a jerk-off. We don't tend to say "son of a bitch". In fact, the most egregious and most obvious one is much more an American insult than British, doesn't mean we don't have racists, they just tend to use different words. But you still wouldn't use it here.
We can't talk about how the polarisation of debate has made debate impossible if posters are determined to defend a complete stranger's tweet because a: Harrop and b: meatballs.
As I've said before, American debate, on an American website, it's not unfeasible that Twitter accounts would take a particular meaning from a weirdly specific tweet.
The best I can say it that it's 50:50 whether E was being deliberately inflammatory, and pp are right, there's nothing directly linking Harrop to the tweet. And regardless, nothing gives him the right to dox or intimidate someone.
But please, another ten pages of "yes definitely meatballs, I've never even heard of any other meaning" is not helpful.