I'm sorry to disappoint you, but no. After Lv30 it really just starts to get toxic. But a different kind.
Lv1 - Lv30 everyone knows people are new, but trash talk anyways.
After Lv30 you get these people who think they're insanely good (while being in Bronze1) and trash talk down to the people in Bronze 5.
The people in Gold5 trash talk down everyone in Silver, but not just "you're bad, L2P, et " , but genuinely harassing them with profanity, homophobic slurs, or the good old 'kys' . So it's a different level of toxicity.
And then you might think it gets better in Diamond? Nope. I'm not there myself, but I have friends who are, and they are saying D5 is the worst place to be in terms of toxicity. Because people are so extremely entitled there and tilt so easily, that after getting ganked and giving the enemy team FB, most of the time they either give up and open their lane, or just ragequit Almost every game.