Asking for reports, is reportable its a form of toxic behavior, just think for example, person A doesnt like person B so person A tells person C to shoot person B, because person B was mean to person A, so person C shoots person B under false pretenses.
Thats mostly the reason why its reportable, because lies and bandwangoning exist.
You don't have to say "report this person", simply say in-game " this person is doing this, if its against your beliefs, please do the right thing."
You can't force someone to report and some people just don't give a fk and move onto the next game which you should be doing, they are words, if it affects your experience and gameplay so much simply mute them individually or /MuteAll , if they are actions in game that physically affect your gameplay in a way you cannot prevent, then report them