What do you say one move from mating your opponent!

There's so much I could say here but I'm absolutely positive it would get me instantly perma banned from this site so I'm going to hold off instead. Let's just say that people like the OP make most of the world sick.
Can a mod just delete this complete waste of space?

When I first learned to play chess, I didn't set out to become world famous for looking this sexy as I delivered checkmate.
It just sorta happened that way.
Typing anything is gloating and immature, you let them take thier move or resign and then if required take your move and say "GG" or nothing. Anything else is unsporting and childish, which does nothing for either player or the game. If he types something like "Oh I think I am in trouble" a polite reply like "Yes, this is your last move regardless, good battle though" would be acceptable and warranted because your opponent instigated the topic. In OTB you can say "Check and mate in three" if all the other moves are forced, you need to be 100% sure before calling this. In online ches with just one move it is is soley bragging, like a child showing thier parents the latest toy nana gave them!!

Let's just say that people like the OP make most of the world sick.
Well..... the Doctors to Patients ratio is about 3:1 and the doctors will be pretty jobless without people like the OP.
Typing anything is gloating and immature, you let them take thier move or resign and then if required take your move and say "GG" or nothing. Anything else is unsporting and childish, which does nothing for either player or the game. If he types something like "Oh I think I am in trouble" a polite reply like "Yes, this is your last move regardless, good battle though" would be acceptable and warranted because your opponent instigated the topic. In OTB you can say "Check and mate in three" if all the other moves are forced, you need to be 100% sure before calling this. In online ches with just one move it is is soley bragging, like a child showing thier parents the latest toy nana gave them!!
You've got an excellent point. What I would say to you is that I honestly don't believe people in general have good sportsmanship in chess.com. Some people do, but most people don't.
I do support your point and agree to it.
It is best to simply say nothing. Chess is a quiet sport. A player should not even have to anounce the upcoming moves for the checkmate. If the opponent sees what is coming, the opponent will most likely resign, unless the opponent believes you may not see the combination. If the opponent does not see what is coming, the opponent will just play on, and you just need to checkmate him. I don't think you should tell your opponent "It's mate next move" or stuff like that.
Thanks for the game is usually a good bet