Is this being toxic?

I know posting something like "ez" is toxic and unsportsmanlike like but lets say you get a quadra kill and thanks to that you can finish the game and the only survivor in the enemy team is the support, of course the support can't defend against you and you can't kill the support because they're full hp next to there fountain so they can always go back to deny you your penta. Now lets just say in the same scenario above the support suicides without attacking you cause the defending support knows you can end and wants to give you the penta. Now in this scenario if you type "ty" in all chat is that being toxic? I know it's toxic or unsportsmanlike to type "ty" after lets say you steal baron or something but in the scenario above is it toxic?
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