As a native pole, it means way more than just fuck u thats used often in english/on forums, he added "zjebie" too which means something like retard/dickhead/wacko etc

Basically saying to some1 "piedol sie zjebie" means irl u asking for being punched in the face, person had to offend u majorly and u are willing to go all out to fuck him up or die trying- there is a reason he didnt use standard english "fuck u" coz it simply doesnt seem heavy enough ;P
No idea why he did it, but lets not forget he is polish guy married to polish woman, so who really knows what kind of suffering he has to endure on a daily basis, it takes a toll on a person(know too many of my buddies personally who are slaves in sexless mariages xD ).
Maybe its a temp ban, he will cool down and come back in few weeks