A toad, a lying piece of excrement, vile, thick, a “dick”, dangerous, supporting “paedos, gang and child rape”, a “dog,” hateful, a “vile excuse for a human being”.

These are just some of the more polite (and hence printable) insults thrown at me by some 500 Ukip representatives and supporters in an apparently organised attack through social media this week.

I’m either Trotskyite or fascist, they say (difficult to comprehend how those two go together).

Although I regard it as pathetic, many people would find sinister their messages to me saying they are “looking forward to my demise”, “the sooner extinct, the better” and I’ve got “nowhere to hide”.

What has generated all this manufactured fury?

It seems they’ve noticed a two-week-old comment in which I drew attention to a blog by the protest group Disabled People Against The Cuts (DPAC), who are by two-thirds victims of the iniquitous bedroom tax, which lambasted unsavoury and offensive statements about disabled people made by Ukip candidates or in Ukip policy.

The article showed how Ukip defended the right of one of their local candidates who they described as “excellent” to argue for forced abortion of disabled foetuses; how their 2010 manifesto contained proposals for learning disabled people to be put in segregated communities, and how Ukip’s leader personally said another local candidate could not stand for the party because of his physical disability.

DPAC carefully referenced these claims, and I saw that each was based on reporting by independent journalists in national media, where Ukip had been given a right of reply and to correct any factual inaccuracy.

Nevertheless, the blanket denials and torrent of abuse from Ukip against me for simply drawing attention to the article continues unabated.

Although those sending the messages profess to care about disabled people, without a jot of irony or self-awareness, one declares me to be a “loony”.

But that’s hardly surprising when one of their MEPs who’s bothered to ask me directly about this, is the very same one who the parliamentary record shows used the word “autistic” in a pejorative way to attack a political opponent.

So what does all this say about Ukip and its supporters?

That too many of them appear to hold offensive and discriminatory views against disabled people.

That they embrace an unbelievable hypocrisy by repeatedly defending their own statements as “free speech”, while denouncing the right of those of us who disagree with them to do the same.

That they have been cushioned by the free ride they have enjoyed for too long in the British media, and are totally unused to being held to public account for their views and conduct, in a way other parties standing for election always have.

Ukip members should be angry if they really cared about disabled people. They should share the rage of disabled people who are by two-thirds of the victims of the iniquitous bedroom tax, have suffered the indignity of Atos “fit-for-work” tests unfit for a civilised society and that families with disabled members have been made five times worse off than others by this government’s spending and benefit cuts which the Hardest Hit coalition calculated has taken £9bn out of the pockets of Britain’s disabled people.

The newly-elected cohort of Ukip MEPs could share my own anger about Britain’s record, when comparing it to the increases in disability benefits in France and Belgium despite austerity measures, in a laudable attempt to protect disabled people from the worst ravages of the economic crisis.

But instead all we see is a mock anger from Ukip, defending the indefensible within their own party, and attacking a group like Disabled People Against The Cuts who – by the way – have robust criticisms of all parties, including Labour.

To make my own position clear.

I worked with a disability charity for nine years before being elected to the European Parliament and am unapologetically a lifelong campaigner for disability rights.

As either chair or vice-chair of Europe’s all-party Disability Rights Group of MEPs continuously since first being elected, I have and will always hold out the hand of friendship to other parties who sincerely want to work together to improve the rights of disabled people.

But like any other equalities campaigners, if I see or hear discriminatory actions or behaviour, then there is an obligation to challenge them.

Richard Howitt is the Labour MEP for the East of England and vice-chair of the European Parliament All-Party Disability Rights Group of MEPs