On the other side, suggest there's a significant problem re Islamism in the UK (and I do think that, in fact) and you will likely be deemed Islamophobic. You will also be labelled Islamophobic if you defend the right to free speech of someone like Maryam Namazie. Or if you believe Islam is a root cause of terrorist violence (which I do).
In each case, there's an attempt to stifle and silence dissent with a shaming accusation of bigotry. For of course, the one thing us lefty liberals can't bear to be accused of is bigotry. 'Anti-semite!', 'Islamophobe!' Gets us every time. We start self-censoring for fear of being thought bigoted.