ST gets attacked for voting Tory, but he was clearly man enough to admit that, now man enough to admit that was a mistake, and now goes even further by campaigning against them, fair play. Whilst he might annoy some leavers and is passionate about Brexit, his points are still quite valid and get limited counterarguments. People attack his vote, or his persistence, rather than his points, which is what people do when they don't have a legitimate argument.
Most of the people attacking ST are the Brexit voters, other Tory voters and Tory enablers (those who didn't vote, or voted for a person with zero chance of beating the local Tory). These people either don't admit their mistake, don't realise it was a mistake, or are so well of where they won't be impacted regardless. That's all fine of course, and their choice, but most rational people, who are not rich are going to think the leavers choice was foolish or selfish, an opinion which they're entitled to.
People did have their reasons to vote Brexit, we all know what the root of it was, and we know the other reasons were contradictory, or a fallacy.
Lavers don't have to provide an explanation or a defence, but I think the poorest, who will suffer most, probably deserve one. If Brexiters won't provide the explanation, then anyone with any logic can, or at least point out the big problems as they emerge.