I grew up in a time where it was expected for kids to respect parents! Today I see kids raising their voices at their parents, cursing around them, slamming doors, telling them what they will and will not do. In fact we called all adults Mr. or Ms. and no one introduced a 3 year old to an adult by having him or her call the adult by their (first name). Being on a "first name" basis with children alone helps to foster the belief that children and adults are on the same level. Having them preference a statement by saying Mr. or Ms. provided a sort of "buffer" between adulthood and childhood interactions.
Another mistake a lot of parents make is giving their children too much "input" or choices as to how things are going to go before they're mature of enough to know what is best for them
Back in the 80s I was doing research on an organization called "Tough Love". It's a support group for parents whose children have "taken over" their households. I saw couples who were lost on how to handle 6 year olds!
If anything I believe too many parents are trying to be their children's "best friend". They're scared to say "no" to them let alone punish them. I knew one woman who had no "bedtime" established for her children they could stay up until they fell asleep on their own. When they got older they didn't have to clean up after themselves, make beds, or do anything around the house. After they finished high school they continued to live at home playing video games, getting high with their friends, having sex in her house with their girlfriends. The only way she got them out of her house is because she moved in with her boyfriend and her adult sons went to live with their father.
The number one responsibility of a parent is to nurture and prepare their children for adulthood responsibilities. Kids (earn) respect from their parents by demonstrating maturity and behaving responsibly. One man's opinion! :-)