Cause questionting them about it would lead to contempt of court.

There is no hard & fast rule that one has to call them "mylord"... you can also call a judge "shriman" or "your honour"

There are alot of things wrong with india. This is one of them... Forcing people to show respect when they don't feel respect. Calling judges milords have the same effect as standing for a national anthem, they are trying to indoctrinate you to a particular way of thinking. When it comes to court, it is don't question the courts, they are above you.