Hearthpwn

Roping isn't against the rules, nor can you prove that they're griefing you. Some players are simply slow/thoughtful, some have a bad connection (I experienced this a lot when I first started playing), and some have simply gone afk for most of their turn. It's extremely annoying when turn after turn you have to wait for that rope to burn down, but how do you verify that they're targeting you, and then how do you prove it to Blizzard?

Lifecoach used to rope every turn, and I'm convinced he partially did it to try and frustrate his opponents into conceding to simply save time for themselves. I'm glad he left Hearthstone, but he gave a wide viewership to a strategy that is simply awful to face. It sucks the enjoyment out of matches (especially when you lose those matches) because it forces you to wait longer than you would normally have to wait, staring at the screen while your opponent either waits to end their turn after playing or waits to play their cards just before the rope burns out.

This is just a part of the game, so your best punishment is winning. I wouldn't recommend emoting, because it lets your opponent know that you're pissed off, and it adds to another toxic practice that HS players love to take part in: griefing with emotes. Again, not something against the rules (it's built into the game for the purpose of being used), but the way it is sometimes used is intended to mock or frustrate the other player.

Until Blizzard develops a way to divine a player's intentions for their actions like roping or emote spamming, you're gonna have to suck it up and do your best to beat them. Let them get really good at roping; if you win, you're actually better at the game itself.