If they're living on the other side of the country, I don't care. If they're knocking down perfectly fine, correctly-scaled houses in my neighborhood in order to build huge monstrosities that parasitize the aesthetic niceness of the neighborhood
that is due in large part to correctly-sized and shaped houses then I get upset.
Example happening in my town: builder buys a normal-sized house on a large lot for $800K. Knocks the house down, subdivides the lot, and builds two bigger houses on each lot, and sells each for $950K. If anyone complains, they get written off as a NIMBY who is opposed to density.
Due to local regulations, you need more driveway curb cuts, so the tree-lined street starts to become less tree-lined. You now have two 3-story townhouse style homes right up next to mid-century ranches or bungalows or Cape Cods and it looks garish.