If you aren't doing anything illegal online (pirating, illegal pornography, planning terrorism) these laws won't affect you.
The problem with that is that what can label someone as a person of interest with subsequent consequences as ending up a no-fly list often is nothing more than very vague connections to a suspected terrorist, visiting a site or video deemed illegal etc, for an example look at this statement from the London Metropolitan police:
The MPS Counter Terrorism Command (SO15) is investigating the contents of the video that was posted online in relation to the alleged murder of James Foley. We would like to remind the public that viewing, downloading or disseminating extremist material within the UK may constitute an offence under Terrorism legislation.
The Metropolitan police are unable to currently name the law that citizens could be arrested under for watching the video that depicts the beheading of photojournalist James Wright Foley, despite earlier releasing a statement that said any British nationals watching the video could be committing a criminal offence.
https://www.techdirt.com/articles/20140820/12004128267/theres-reasonable-debate-to-be-had-about-showing-james-foley-beheading-video-claiming-its-illegal-to-watch-is-ridiculous.shtml
If you can't even know what is deemed illegal or not how can you be expected to act within the law?