First, you locate your dirty little scrublord in the PLAYER list.

Second,
since some of these children know what they're doing is wrong, they hide their names in-game, so, "GO TO PROFILE" to see their real SocialClub handles.

Third,
copy that ♥♥♥♥.

Fourth,
report these sick little losers here.

https://support.rockstargames.com/categories/115001624507?step=7364346d

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If you have a problem with this guide, you're likely a modder, yourself, and your opinion is as invalid as your existence.