Playing assasins = toxic?

Assasins fit my playstyle the best.I love the adrenalin when playing them and everything else that comes with them.But it has come to my concern that whenever i do play assasins i get called names.My main is Rengar and as ALL of us know he is notorious for his 1 shots.So last game i did just that.I placed my wards around the buffs and whenever the enemy mid/supp/adc went there i 1 shotted them.The thing is,1) i got reported from the enemy adc for being 'toxic' now, you might all thing that i wrote things like 'EZ ,NOOBS,' etc.But i muted them all 10 mins in cause my teammates flamed me.So my question is,does me playing an assasin makes me toxic? And if yes ,the kog maw who is getting 3 shields per 5s and 2 heals every fight what should i call him?if i am toxic he should be permabanned.