So I get banned because my ISP sucks and my internet is terrible? 
If it is affecting the gameplay mechanics for other players? Absolutely. You would presumably receive a warning or notice that your connection was subpar, so you wouldn't be banned unless you persisted in playing with your known-to-be subpar connection.
If someone was purposefully messing with their connection to make them warp and affect their ability to be hit, the overwhelming majority here would have no issue with banning them. Why then should someone with an identically-same problem receive a pass because it's due to their ISP? Rules are enforced got the purpose of fair gameplay, not to make people happy.
If you cannot afford or otherwise obtain a good connection, you have no business forcing your connection problems on others. Only a selfish person would argue otherwise.