i know it’s not always obvious whether someone tagged a post if it’s been reblogged a bunch but frankly i think it’s common courtesy to click on op and check? i know yada yada all tumblr posts are public but i do think it’s rude/bad online etiquette to respond to a short, uncapitalized, untagged post with lengthy disagreeing meta, even if you’re not personally attacking the op
it’s bringing a different level of discussion that was invited and i feel it carries the assumption that people aren’t bringing correct intellectual rigor to their casual posts