Perhaps he shouldn't care about a conference but when the deranged people start affecting employment, then they have crossed a line. Then it's all out war.
They should be ostracized, shamed, fired and barred from employment. We should prevent hiring anybody who shows any sign of belonging to the PC-brigade. (Make no mistake - they are already doing this to their perceived "enemies", and not just based on opinions but even sex and ethnicity.)
We should make companies understand the incredible damage these people can cause.