There is the diagram that shows the extreme left and extreme right have actually circled around and met up.
The bottom line is that this 'extreme right' phrase is often weaponised by the left who when they say 'left' mean 'good people' and when they say 'right' mean 'bad people'. It's a major problem that the left have. I won't go into the many problems the right also have; the entire political class is currently one large chocolate teapot.
The issue isn't whether the person votes labour or tory. The issue is the extremism.
Just as the issue is not that a person self identifies as trans, the issue is the behaviour and harm towards others.
It's the entitlement, selfishness, narcissism, absolute lack of boundaries or capacity for social contract, desire to smash things and injure/sexually assault people, desire to do whatever impulse strikes without accountability or responsibility, and desire to enjoy other people's shock, disgust and distress that is the issue.
How the person votes or chooses to name their inner sense of gender at the time is irrelevant.
Until of course a large powerful and rich political lobby forms around this behaviour and insists it's an integral, normal part of being LGBT and that they speak for every LGBT person when they say this, (excepting all the LGBT people they've threatened and excluded from LGBT spaces and activities for disagreeing with them.) Then it becomes relevant because the behaviours are being forced into law and the bloody police force ffs co opted into being a private enforcement unit for an extremist religious belief, so said people can do their thing and no one's allowed to say no or not be a prop on command.
The question in both the 'extreme left' and 'extreme right' and 'extremist political lobby' is: what vehicle is this providing them with to carry out the behaviours they want to indulge in? Why is it so very useful? And who is it who is benefitting?