As long as you are trying to win, and communicating with your team (and especially in normals), then you won't get in trouble or be banned. Occasionally teammates might get a bit toxic, but if you don't respond in kind (or y'know, at all) then you're fine.
If things are super janky and not just sorta not ideal but ok I guess, then maybe run it by your team in champ select first. Theres a lot of 'off-meta' or weird picks that are still fine, but they're just not top 5 in the current meta and hence off-meta. For example I've been doing a fair bit of kayle support recently, which is somewhat off-meta, but she is/was a popular support pick once upon a time, she's just somewhat outclassed in the role these days, so most people don't care. If I were to try to do something like master yi support on the other hand, that might not go over so well.