Taste is subjective and while i don’t think you can learn it, i do think you can put yourself in positions to uncover it. almost like digging a hole in area of the ground that seems interesting to you and finding some gold. The only way to find that patch of grass, though, is to follow what you find to be intriguing and to be open enough to respect and accept people’s interests. you also can’t influence people to have good taste. They might take your advice and wear the clothes and listen to the music, but if they don’t truly own it it’s not their taste — they simply did something based on your taste. this is such a good question