Indeed no man is an island, this is why the feelings of others in their own comfort zones - must be a constant consideration (even if we never heard of the ages old advice of 'treat others as you would wish them to treat you...erego I do NOT do this to other people....even though this basic fact is overlooked by those who habitually do this to me) when tempted to respond semi-publicly (on a friends private FB accessible to 'friends' only) some people may view your public divergent views as more of an 'I want an audience to read this soft core drama' more-so than "Hey, so and so is just trying to offer me a different perspective for my own consideration" - as I only believe THAT to be the intent - when 'so and so' delivers their perspective to me in PRIVATE......for every argument begins at the conjunction of two divergent views.
We can become petulant and 'wrong and strong' and simply say 'Ok then well I will never comment on that persons FB again" (as a minority do), or one could say, "I do not 'have' to post my unsolicited divergent views on others peoples spaces..I accept that it is just something I 'want' to do....and therefore - in this person's case (who obviously does NOT appreciate it) I will simply refrain from doing so...after all - he/she does not do it to me - so he/she does have a point about reciprocal etiquette". It never ceases to amaze me at how many human beings seem unable to comprehend such a simple and basic matter.
I don't know very many people who 'can't wait to post something on their FB and have others disagree with it', it is like the fact that EVERY parent thinks their child is handsome/beautiful...to you the child might be ugly as hell....but you would not normally post under that parents caption of their 'Handsome stud of a son' or 'Drop-dead Gorgeous daughter" - a comment like: "Not in my opinion!"... would you? Why not? It is your 'exercising your right of free speech' (which you should 'exercise' responsibly - not in wanton ignorance), ...and you MIGHT even find the rare parent who welcomes your divergent honest opinion of their child's features and achieves personal growth by having to face the reality that their child is actually NOT visually attractive looking to most other human beings at all...but I think more than likely - you will only insert a negative vibe into that person's happy comment by doing so...and in your heart of hearts - you know that to do so would NOT be a 'good' thing to do to someone's else. What is so 'vexing' about anything I have said above that it is so unconscionable for YOU to put into practice?