Cuz it’s could be an insult or a compliment, your performance decide, if you did greater than your equivalent on the other team then you shouldn’t be offended by it, yesterday I literally told my friend(who’s played Tank) before our game: I’ll write “tank diff” at the end no matter what so you should preform good, and he did! And it was a compliment.
So if you got offended by seeing it you should reconsider your choices in game and how you did preform
If you wanna compliment your tank (or the enemy tank, even, I compliment enemies a lot), you could just say ‘Good X’ to them.
Making it explicitly about how one person did activelt worse is inherently toxic. If you want it to not be, focus on building up the person who did well, not tearing down the one who did poorly.