Also, I’m terrible about complaining on board without sounding like an entitled ****. Some people seem to have a knack.

Wondering again from crew perspective what makes a complaint reasonable and most likely to result in a resolution without upsetting anyone? What gets your back up, and on the flip side, what makes you more inclined to help? Of course I’m assuming there’s a difference in cabins (e.g. I wouldn’t complain the sparkling wine was not up to scratch in economy, where I usually travel).