At the beginning on i was just ignoring them. Meanwhile i'm warning that if they keep doing their inadmissible behaviour they could be reported and muted in the future. Actually me personally don't have the nuts to send an e-mail to the support with a screenshot, although i can do it in no time. Even if that person did insulted me in a hard way without a reason. But all the time i talk me out of it, saying to myself, maybe they just overreacting and it's not the case to make this to a big deal. But i think it worth enough to warn them, that they are doing wrong. Some other players could just send screenshot without warnings and then after some days come a big surprise "OOPS WTF i CAN'T WRITE IN A CHAT ANYMORE!!"
So that such things does not happen we are all supposed to warn people if they go over the line at the some point, instead of silently report them. Much of peace and love to all of you, let's bring some education at the poker world and not just punishment.