I mean yeah, some versions of the bible use 'honor' instead of love. To love your parents is an interesting request.
Lets go pretty bad as someone used earlier: you have drunken abusive parents...now obviously you don't HAVE histo love them, but should you?
I am not going into detail, but I will say I didn't have the perfect parents but had I not shown forgiveness or unconditional love (there are consequences for what you did, but I still care about you) I wouldn't really have a relationship with them.
This also ties win with the sincerity topic on religion: you have a boss who asks you to not to wear that specific watch to work ever again. You can wear anything else, just not that watch and doesn't give a reason, You could choose to say that your boss has no grounds to say that and disobey or you can say I don't understand why, but you are my boss and I will respect that.
From my experience, if the question stated by OP was 'should we' instead of 'do we have to,' I would say yes. Brings a much better scenario, even if you have the worst parents ever.