I mean that comes back to the idea of how much should you need to sugarcoat explanations of absolutely fundamental topics
Speaking as a former team leader / trainer / supervisor, Ive never needed to 'sugarcoat" anything. Then again, all my coaching sessions have been with the aim of helping a person improve, not using their mistakes to belt them over the head with. More than a few of the people I trained went on to be promoted, which delighted me no end. I didnt care they got promoted above my head, THAT was the proof I had succeeded.

And thats another thing, if you do it in a hostile manner and in front of others, youve just broken a cardinal rule: praise in public, reprimand IN PRIVATE.

Offer to HELP, not criticise. One way gets them to listen to you..one doesnt.

If someone is spamming cure 1 there is only so many nice ways to tell them that they literally have no idea how to to play the game
Funny, I can think of any number of approaches that will accomplish that purpose..but then again, I start from a position of respect and basic courtesy. Youd be SHOCKED at what happens when you start a suggestion in a tactful, friendly manner.