It is not permissible to hate your parents and deal with them badly
even if they are very bad persons. Allah The Glorious said in the Holy
Qur’an : But if they (your parents) try to make a polytheist (Mushrik)
then you do not obey them but behave with them in this world kindly
(Surah Luqman ; Verse 15). So even if the parents are so bad and try
to make you a Mushrik which is the most dangerous major sin, you
should not obey them but you must continue dealing with them nicely.
The parents who do bad, need more Dua (supplications) from their
children to be guided to the right path.

If the parents insult Allah (SWT) or the Holy Prophet (SAWA) you should not join them at all while they do that.

 If the parents don’t give you your rights that does not mean that you forget their rights on you as your parents.
Their sinful acts will be on them and you must fulfill your
responsibility in being always kind and good to them.

Wassalaam.