Nuance always matters. Context always matters. You won't derive meaning without them. (And if you aren't trying to derive meaning from something, if you're just aiming for the reptile-brain blood rush of Airing That Opinion--frankly, there are easier methods to replicate that that don't involve bothering other people.)
And while I am emphatically not accusing you of anything in your post, my experience has led me to the rule of thumb that the fear of such a rhetorical dismissal, as you expressed, stems from a desire to dismiss out of hand something challenging. It is in almost every case I can think of a do-unto-others-before-they-do-unto-you defense (even when, as is generally the case, nobody's doing unto you in the first place), so I'd personally think pretty hard before being too holy about it and telling vidarh what's frowned upon here.
