You got a warning for telling the other player "now you can just go fuck off" at the end of the message that was flagged in the report.
In the game you said you would report them for their swearing too, and if you did they also got a warning for it.
If you didn't, then there is a 50/50 chance the moderator that handled the report about you took the effort of making a report on the other player on your behalf.
The calculator thing your opponent was talking about is the Analyze Attack function.
This is obliviously not cheating, so the player you beat is just a sore loser.