Why do some villagers point fingers when they return to the countryside to speak Mandarin?

Since high school, I have left home, first to go to school in the city, and then to go to college in the provincial capital. The distance from my hometown is getting farther and farther, but my heart misses the place where I raised myself more and more every day. Later, I went to work and returned to this place that I used to hate, but now I miss it so much. You can't forget your roots. That's probably what it means! After many years abroad, I always feel that although Mandarin sounds good, sometimes it really can't express the kind of feelings I wanted at that time, and the existence of dialects is its meaning. Back in the countryside, I never speak Mandarin. First of all, I don't want to say how others will feel after listening. I feel embarrassed to say it myself. They are all a group of people who know each other well. Who stutters, who speaks loudly, who swears, who speaks with some ink in his stomach, who knows better than who. I was originally from the countryside, but I have been away for several years. Why has my speech changed? There is no need to make yourself different, and there is no need to let others know that you have gone out to see people who have increased your knowledge. Grasp your soul honestly and don't forget where your roots are.