Agree. It is disrespectful. Two scenarios come to mind that I have had experience with. Girlfriend's parents live near us and someone on that street decided to paint their house the most ridiculous color. It is not even tasteful. The trim doesnt even match with the house color, shingles, window shades or with anything else. Wish I had a picture, but the owners look like they just chose the most random color and splashed it all over their house. This is after having it painted "primer" for a few months did they choose this color.
Sure, we could go over and complain but we have no legal leg to stand on. And for what, to make enemies with neighbors? Sure it might suck that they chose this color but I honestly don't know what we can do about it. My gf is a realtor every time she shows a house on that street, she chooses to take the perspective buyers to the house via another street so they wont have to pass in front of the eyesore.
The second situation is someone who lived right across the street from us. Same as you, never maintained his lawn, let it grow to unimaginable heights, gutters falling off of the roof, badly in need of a paint job etc etc... He also worked on his truck when he was home and there were always parts, tool chests, tire rims, kids toys and all kinds of junk strewn everywhere. His next door neighbor got so fed up with it that he himself one day went over and offered to help the guy mow his lawn. The guy refused any help. A day later, his son, according to our neighbor accepted the offer for help out of embarrassment, and the lawn was cut. In 3 weeks it was back to sky high again.
The guy ended up moving out because his home was foreclosed. The POS left a dog at the house that nearly died, abandoned it with some food and a bowl of water inside the premise. We found out when we saw animal control there. The house was repossessed by the bank and the guy tried to come back to gather some belongings. We all hated this guy so much that we called the police and reported the trespassing every time we saw him try to get more of his junk out of the house.
My two examples point out how much control you ultimately have over the actions and cleanliness/maintenance habits of your neighbors. Even if you try talking to somebody, your offers of help or suggestions on how to clean up will not be accepted. Even if the town has an ordinance about lawn height for instance; a lawn needs to be mowed every week. By the time the town takes action, the lawn is several weeks/months past mowing. Sure it will get mowed but it will take another month for the town to act yet again.