Is buying weird items considered troll / griefing and can I get banned for it?

Yesterday I tried a champion Shyvana, since I'm new to the game, and know nothing about how to play and what items to buy for that champion, I found a guide on the internet, it was the most upvoted one so i supposed i should go with it. It recommended me to buy magical items, so I did, but a guy in my team kept pinging my items and being toxic towards me, saying that i'm trolling and will get banned for this, ik he might be just in the heat, but is it actually bannable / considered a troll if you buy weird items for a certain character
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