In my opinion if you're playing against someone who doesn't get triggered by video games easily then the emotes mean exactly what they do at face value during games, and you can tell that the other player isn't just trolling. However, I feel that all of them are just BM tools when you're winning and the other person is mad (Completely agree with your perception about the threaten emote
), the other person is winning and are trying to see if them rubbing it in will trigger you, or the other person is bored and is using the emotes to pass the time during games.
For me, Thanks is almost always a bm emote for me to use. I don't see how telling your opponent thanks in Hearthstone can mean anything else unless it is used during specific niche situations (such as for intentionally helping you win during co-op tavern brawls or conceding against you at the very start of a match, allowing you to complete your quest sooner). Wow can also be a bm tool when I use it, or simply an honest rng announcement for any of mine or my opponent's plays.
*Eyeroll*, again with the ignorant scapegoating of Blizzard for a common type of human behavior largely prevalent in online gaming since forever. Really this behavior was common long before electronic games or the internet was invented. Competition in any form has always presented opportunity to create pleasure in individuals by demeaning their efforts to beat the other guy, just as toxic behavior also created opportunities for people to not like people demeaning them during games or other forms of entertainment. Although, sure we can pretend that "Blizzards incompetence" created this all (Hint: As much as I enjoy Blizzard games they are not so important in the world or life that the problems that exist in their games originated & were caused by Blizzard alone).
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I usually do if they are winning and already bming, or if they are going to win soon (though if I enjoyed the game I'll leave it on). I honestly find it surprising how many players actually do bm emote you at the end when they win even if you weren't bming them or using a deck like aggro or something. If I did squelch them, but I then turned it around I will unsquelch them just to hear them bm. Honestly I take some amusement if people are angry about losing and are trying to use the emotes as some unofficial revenge tactic to throw out there or something. I mean it is just a game, are there really that many people who get angry over video games & people who may beat them? lol xD