It's pretty common to call all wind instruments horns in a band context, it is a trumpet but most musicians aren't going to be mad at calling it a horn. Still a bad pick up line
Trumpeter here, I'd be insulted if I was called a horn. Might be regional, but that's not common here. If we're speaking about horns, it's only French horns
In horns, unlike some other brass instruments such as the trumpet, the bore gradually increases in width through most of its length—that is to say, it is conical rather than cylindrical.[1]
Which seems to specifically exclude trumpets from horns.
It's pretty common to call all wind instruments horns in a band context, it is a trumpet but most musicians aren't going to be mad at calling it a horn. Still a bad pick up line
Trumpeter here, I'd be insulted if I was called a horn. Might be regional, but that's not common here. If we're speaking about horns, it's only French horns
https://en.m.wikipedia.org/wiki/Horn_section
Trumpets belong in a horn section
Doesn't look like that article says anything about trumpets to me. It does link to this article about horns, though: https://en.m.wikipedia.org/wiki/Horn_(instrument)
That one says:
Which seems to specifically exclude trumpets from horns.
Also the popular music section includes two photos with people playing trumpet and lists a bunch of horn sections, most of which contain trumpets.