Ask about the Galician language, and refer to it as “your dialect.”
Galician (galego) is one of Spain’s official languages, along with Catalan, Basque, Aranese, and Spanish. We know, most people abroad don’t know about it (we clearly have a marketing problem — everyone knows about Catalan and Basque!), but that doesn’t mean it’s not a language in its own right.
Refer to it as a dialect to the right person, and you might even get a free history lesson after being asked, “A dialect from what language? Spanish?” Nope: Galician and Portuguese used to be the same language, and no one thinks of Portuguese as a Spanish dialect. After Castilla conquered Galicia in the 13th century (a century after Portugal’s independence), early Galician-Portuguese fragmented and started evolving in different directions, giving birth to Galician in the north and Portuguese in the rest of the territory.