Write him special combination of words "Ebal tvou mamy"It's probably will make him more angry, but do not despair. Typical answers would be "Иди [censored]", "Я твою мамку ебал", "Пидорас" and etc.

In Russian language there is one word that people call everyone, doesn't matter how old are you: "Shkol'nik, or just Shkolnik", (kid, schoolboy) feel free to use it

After the last step, you should immediately write "Idi naxou", "Yebok", "Eblan" and then, probably he will leave you ^^Thanks for attention, pls rate <3