This thread is like a litmus test of 'reasonableness'...

the reality is that filtering, like virtually everthing, can be either completely acceptable or thoroughly rude, even dangerous - it depends on many factors.

Only some posters, however, can see the issue past their own filter of prejudice and ideology. This inability to simply see things from another's point of view, and accept that those have at least the potential to be valid, is exactly what sinks half the threads in this subforum into idiocy and petty bickering.