Would something like this be considered toxic?

Some would argue that it depends on if the player addresses your champion (ex "Hey Brand, kys.") or the player by name (ex."Hey WhoremOnes...kys") along with the context and tone of chat leading up to it. If that's ALL they're saying the whole time then yes, I personally think it's toxic. The intent is clearly to throw someone off their game by pushing buttons like a 2yr old. I'm of the school of thought, "follow your gut". If it walks talks and acts like a duck, it's a duck. Mute + Report (but let your team know you've muted that person and why when you're in the shop if they're on your team).

Yes....

In general, if you have to even ask if something can be considered toxic then it probably is.

Its pretty difficult to find anything that Riot and its community here on the forums don't consider to be toxic.

Reportable for innapropriate username.

GGEZ