Pat, the internet and social media in particular, offers the ability to create and publish and provide virtually unfettered access to offensive material. It is not like a shop front, or magazines in wrappers, where purchase/access can be vetted. And that access has consequences - such as youth suicide, self-harm and mental health, sacrificed in support of free speech where anyone can say/publish/promote any views.
The material encouraging radical extremist terrorism is published on the net. I agree, you do have a choice as an individual to see/read - and everyone else does too -- even those who are susceptible to those views that may not have the maturity to deal with it (and we know who they are, we label them as "others" and easily dismiss their concerns). You could be accused, under the guise of the argument "you accept what you are prepared to walk by" support for the most extreme behaviour through your no censorship position (the No Decision is a Decision argument)
If you think I am conflating the protection of children with the right of adults to hear from all sides of a debate, are you trying to artificially separate the free speech debate? The act of separation could be viewed as censorship and decisions/criteria are applied. It happens in many areas, and unequally in different media.
The free speech argument is an attractive proposition: it is an absolute rule and has simplistic appeal, but I do not think it is so simple, and neither is censorship. Nanny state complaints, where one set of regulation (censorship) over-reaches to control access or behaviour, are about where/if those rules should apply or at what level they should apply. Generally, "censorship" regulation should set a minimum acceptable level of behaviour and individuals can then apply personal constraints on top of those.
Bullying - there are various legal protections in the adult/business world governing unfair threats, slander, harassment, discrimination: they are politcal/state rules - not formulated or enacted by one's own commitment within a workplace or school. Prevention is better than the cure. There are various ways to support prevention - parenting/ education. Is censorship a mechanism that can be used to prevent the spread of bullying behaviours? Any censorship mechanism would, I expect, need to be the enaction of a regulation/ political decision.