Remove the take back request in classified games

Is it possible to remove the possibility to ask for a take back in classified games ? And let it only in friendly games ?
I'm often asked for a take back during classified games. It's not that I care a lot about my ELO, but I consider chess is not a "take back" game. I have lost quite a lot of games after a blunder ! Sometimes people get angry when I refuse, and I have even been insulted on the chat.

Thanks, and kind regards,

In your profile's preferences, "Game behavior" section: set "Takebacks (with opponent approval)" to "In casual games only".

And if people insult you about it...well, they're jerks.

@MrPushwood , what do they say? It takes a big jerk to start a lawn mower?