There most definitely should be ethical requirements of civility in reference to how lawyers conduct themselves.
Whether a lawyer is for or against a side, they should always respect them as a person.
Being in such a formal setting requires formal behavior as well. If a lawyer cannot be civil and maintain basic morals, then perhaps they should be sent out to compose themselves.
Acting without ethical civility is immature. A professional should not be unable to control themselves in a legal situation. If a young child is expected to be "nice," then an adult lawyer should be held to the same standards.
Success is largely based upon their ability to fit the setting in which their work is completed.