ת"ר איזהו מורא ואיזהו כיבוד מורא לא עומד במקומו ולא יושב במקומו ולא סותר את דבריו ולא מכריעו כיבוד מאכיל ומשקה מלביש ומכסה מכניס ומוציא
The rabbis taught: what is 'awe' and what is 'honor'? 'Awe' is not to stand in his place or sit in his place and not to contradict him or support his arguments; 'honor' is to feed and give to drink, clothe, transport...
Rabbi Joseph Telushkin
The surprising feature of the Fifth Commandment is its insistence that we owe our parents honor, while saying nothing about loving them. It is not as if the Torah is reluctant to command love: “Love your neighbor as yourself” (Lev. 19:18); “And you shall love the Lord your God” (Deut. 6:5); “You shall love the stranger” (Lev. 19:34).
Why then are we not commanded to love our parents?
I think the real reason is that the Torah realized that it is harder to command love in a relationship as intimate as that between children and parents; either the love is present or it isn’t.
In addition, many children, much as they might love their parents most of the time, go through periods of estrangement from them. Thus, what the Torah is offering us is a guideline for behavior even during those periods when we might not be feeling loving toward our parents. Even at those times when we feel our parents have not been fair to us, or even when we have seen them do something we regard as wrong, we are still obligated to honor them.