It's a fair objection but, anecdotally, you've got to admit that Farage is more sharply divisive and "marmite" in peoples' perceptions than most leaders. Only a small percentage voted for the lib dems: that's not because the rest hate Ed Davey, it's just because they don't know who he is 😃
Sure, it's an exaggeration to say that everybody who doesn't vote reform hates Farage. But there's a nugget of truth behind it: he's made his name by appealing very strongly to a certain part of the electorate and not caring about how he's perceived by the other part. In fact you could even say the antipathy of the other part is part of the appeal. Every time woke lefties start fuming about how much they hate him, it actively encourages those who support Reform out of "protest" and makes them double down.
You could say much the same about Thatcher, or Corbyn. Whereas a lot of other leaders appeal by being broadly acceptable, rather than enthusiastically appealling, across a wider base. Which is what Starmer's tried to do, although he's failed.
The point of the comment you replied to being, I think, that we need to consider a bit more closely the big media and social media story about Reform galloping ahead and taking over the hearts and minds of the country. At 35% in the polls it did look like they might do that. At 25% not so much. And whereas Starmer got into power because a lot of those who didn't particularly like him at least considered him better than the alternatives, most of those who don't like Farage would more likely vote for anyone else to keep him out.