Be careful when spamming feast chat commands!

[Dimitrii]

Example: If I get a well known bad plat player on my team and they throw the game, i'll use the nice job command 3-6 times. If you think this is an isolated case. You are wrong.

Aww you flatter me. But seriously you must have spammed this more than 6 times cause I'll spam whatever target I plan to attack at least 6 times and have yet to have a GM contact me about it lol. Especially at the beginning of a match if I don't recognize the name of the opposing healer I will spam "Attacking Healer" half a dozen times to get my point across.

[Zojha]

But seriously you must have spammed this more than 6 times cause I'll spam whatever target I plan to attack at least 6 times and have yet to have a GM contact me about it lol.

That might be the case, but remember: No reports, no action. And there's a higher chance to get reported if you're using (and spamming) the commands sarcastically than when you are just trying to get your strategy heard. Especially if, as the OP surmised, it's one of those players trying "to get back at you", who're just yearning for an opportunity to report you. It might well even be that this was the primary reason the OP got warned, with the spamming being mere secondary.

But that's really just speculation.