Do you think it is okay that I heckled someone at trivia for cheating, and I yelled at them.
How would you feel if you were heckled?
I would get angry and I would try to do something back
It is wrong to yell at other people and accuse them if you have no evidence. It is just a game you win some you lose some no need to be upset by it.
They are weak so it doesn't matter if they are upset by it.
If someone is actually cheating, then you should handle it in a calm and collected manner. However, this time it sounds like you were just upset that you were losing, which makes it wrong.