My sister lived in a medium-sized city in the Netherlands for several years and tried hard to learn Dutch, and found it super frustrating. I saw this myself when I visited her there. She would start off speaking Dutch with someone and they'd respond in Dutch until the moment she made even the slightest most insignificant mistake in her speech, at which point they would invariably switch to English and refuse to speak another syllable of Dutch to her.

Living in Korea as a male native English speaker I found the best practice I usually had was with Older women and young women who were too embarrassed about their English skills to even try.