The point is still that if the 'Diversity Cabaret' had conga'd through a UKIP campaign rally or event no-one would have batted an eyelid. It's the intrusion onto a private family occasion that's the issue here, not the protest as such.
I have a great deal of sympathy with the fact that they are protesting against policies they see as socially destructive even if Farage stands little chance of ever getting anywhere near enough real power to implement them. The people minimising that are missing the distinction.
There are no political opinions the holding of which justifies attacking the holder as a private individual in private life, rather than as a politician in public. Behaviour, maybe. Opinions, no.
But I forget, it's OK to attack people as a private individual for their opinions, as long as it's only bad opinions that get treated like this 