There's this funny thing in social norms called mutual respect. Someone provided you with entertainment or useful info, why'd you take his revenue in return.
If content creators want their sponsor blocks being watched, they can make them well integrated in the video and engaging. If a part of the show is not engaging, why would a viewer be compelled to watch it? This is true for whatever part of the video is not compelling to watch, be it a sponsor block or whatever.
Anyway, you were arguing the poster that wanted to skip the block is a "thief": now you are arguing is "being disrespectful". Those are two very different things, even assuming any of the two have merit, which I think do not.
Ultimately content creators need to make the parts of the video they want to be watched to be engaging as there is no legal nor moral obligation for a viewer to watch any segment of a video they don't find engaging.