With dictionaries it's probably more a problem of how big the book is going to be than whether a specific definition "might offend someone." Definitions that aren't in curent and frequent use are likely to be dropped just to save the space on the paper.
Although it varies, in my part of the US there have been a few "slurs" that actually refer to the "Dutch" but for the most part when some illiterate said "Dutch" it was a corrupted pronunciation of "Deutsch" and everybody knew who was being insulted. It wasn't the Dutch.
Probably not well known, in sheetmetal trades the term "Dutchmans" (always with the "s") is still used for compound lever metal snips, without derogatory implications. The prevalent, and perhaps only, manufacturer of them beginning in the late 1930s or perhaps earlier was "Deutsch Mfg Co." It appears to be the same company making them today, although the company name has changed a couple of times and is currently "WISS."