Notably, the police acted after 12,000 people signed a petition asking them to investigate. Lots of people, mostly women I'd say, are all on board with this. The reason why I say mostly women is that a huge number seem to think it is or ought to be illegal to say anything they deem offensive.The GSS contains several dichotomous questions about whether or not proponents of various controversial belief systems should be permitted to publicly advocate said beliefs. For contemporary relevance, all responses are from 2000 onward. The percentages, by sex, who say that those favoring military dictatorship, white supremacism, homosexuality, atheism, and anti-Western Islamism should be allowed to speak in public. Sample sizes are in the several thousands:
|% allowed to speak||Militarist||Supremacist||Homosexualist||Atheist||Islamist|
Except in the rather unsurprising case of strident homosexuals, women tend to express less support for free speech than men do, although the gender gaps are pretty modest.
Conjecturing about what this suggests regarding the validity of Mangan's point, it suggests he's more likely correct than not, specifically since this particular incident involves putative racism.
GSS variables used: SPKMIL, SPKRAC, SPKHOMO, SPKATH, SPKMSLM, YEAR(2000-2012), SEX