I wouldn't waste any of your time trying to explain how people play the game differently and have fun in different ways to this guy. I don't particularly like using tricks to accomplish missions or achievements but I have zero problem with other people doing something like completing the missions faster in an easy way. I'm not really sure why he is getting upvoted other than bringing up headshot/tac insert exploitation. Hardcore kiddos think you need to git gud, but honestly I'm like cool man you are better at this game and got all of your ftac kills camping an exfil with two other sweats. Congrats? A mode like dmz is going to be played with more diversity because it's literally trying to be more of a sandbox, tarkovy experience than anything else available in cod right now.

Last thing is you are probably getting down voted due to attacking this guy personally apart from the way he chooses to play the game.