asking ppl (friendly) to stop pingspam/flame or you mute them. bad thing to do?

whenever someone flames or pingspams i tell them the same message "would you be so kind to not pingspam/flame? its really distracting and if you continue i will mute you" im trying to be nice but also making a point. stop being a spoiled annoying kid because i wont deal with your shit. ( shoutouts @ 0:36) but people told me telling others you will mute them is "negative attitude" towards your team and can get you banned. so is that true? if it is i just remove the "or i mute you" part. its easy to do, but i feel like then the "warning" loses some pressure.
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