What words can get us banned?

So recently the 15-min feedback thing went live and even saying "gg izi" is considered negative I'd prefer muting everyone and enjoy a silent game(indeed with ingame-music), but that results in report for refusing to communicate with team. seems like I'm surrounded by teemo's shrooms, what am I supposed to do? Is saying Good Luck & Have Fun at start, and Good Game Well Played at end, also Well played when someone takes kill in between enough to not get reported for communication issue and what are the words which I should not use like gg easy(or gg hard?) other than which I know of are already negative like noob, kid, mom etc?
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