I agree with Wbeezer and Biscuitsneeded
'Liberal fascism' is a very real thing. The sort who will claim that they are 'tolerant of everything but intolerance' and will use the word 'bigot' as an instant gotcha whenever somebody has very different views from them.
As has been said, this is a massive issue with the TRAs, where people firmly set out their stall in support of one minority/oppressed group and then, sometimes almost by default, end up throwing another one under the bus. Then, people who support the latter group are automatically considered to hate those in the former group, which is usually not the case at all. Of course, this ends up with the one group considering themselves 'true inclusive feminists' and the other group as 'intolerant radical so-called-feminists'. It doesn't help when one group's reasonable requests are drowned out by the screamed demands (and, ironically, threats of violence and sanctions) of the other.
Yes, any kind of extremism is a problem - and I think it might actually be more helpful to see extremism vs TRUE tolerance (balanced with respect and responsibility) as two opposite sides of a circle rather than two ends of a linear spectrum, thus the furthest left and the furthest right effectively meet at the same point, just like a political version of the Diomede Islands.
I also agree re UKIP and Brexit that, just because a lot of outright racists and haters were attracted to them (and the main big parties are also far from immune from this), there are/were a great many people who genuinely, peacefully wanted to take back what they saw as the right to self-rule.
Without wanting to derail the thread, I think many in principle felt the same about Europe swallowing up and ignoring the UK's best interests as many Scots do if you swap 'Europe' for 'rUK/England/London' and 'UK' for 'Scotland'. Do Scottish people hate the English? A very tiny minority do (and the reverse is also true), but the vast, vast majority campaigning to break away simply want to be independent neighbours on an equal footing, who get on well but want to be in charge of making their own decisions.