In many countries, the UK included, many of the posts on the fascist subreddits are illegal.
> But why should we not fight for them?
Because the value of life should be held to higher value than the 'destruction of free speech' (Except Reddit isn't doing anything to their free speech, they're denying them a platform. Which is objectively different). These people quite literally stand for genocide.
> I don't have the right to not be offended
Yes, yes you do. That's part of free speech, isn't it?