Terminology aside, I think the comment was accurate.
I think it would have been better to kindly correct any terminology issues you noticed without saying "nobody actually involved with helicopters calls them" twice. For example:
"While `rotary wing` is an accurate term, most people in the industry would probably call them rotor blades."
I don't think the "copter" correction was necessary, since that is in fact one of the slang terms for a helicopter and it's clear what they were referring to, whereas 'wing' could confuse someone into thinking of fixed wings on the side. But if you were going to mention it, it would have been helpful to mention what you thought would be a more appropriate term.
I'll just finish with this rule from the Recurse Center User's Manual[1] that I think applies very well to this situation:
> No well-actually's
> A well-actually happens when someone says something that's almost - but not entirely - correct, and you say, "well, actually…" and then give a minor correction. This is especially annoying when the correction has no bearing on the actual conversation. This doesn't mean the Recurse Center isn't about truth-seeking or that we don't care about being precise. Almost all well-actually's in our experience are about grandstanding, not truth-seeking. (Thanks to Miguel de Icaza for originally coining the term "well-actually.")
