https://twitter.com/ksturdevant/status/529475599342243840

gistfile1.js

//bookmarklet:
javascript:(function(e){var t=e(".comment"),n=t.find(".md > p");n.each(function(t){if(/^not\s+\w.+but/ig.test(e(this).text())){e(this).parentsUntil(".comment").parent().hide()}})})($)

//un minified:
(function ($) {
	var c = $('.comment'), t = c.find('.md > p');

	t.each(function (index) {
		if (/^not\s+\w.+but/ig.test($(this).text())) {
			$(this).parentsUntil('.comment').parent().hide();
		}
	});
})($);