This is a more shameless way, suitable for more lively people. When the coach asks you to apply for a card, you just shirk it and never do it. You just have to pester him to teach you. No matter what he says, you just don't do it, preconceived. In the long run, he will be afraid of you. Whenever he sees you in the future, he will hide immediately. You don't have to hide. Of course, this method also needs some thick skin. If introverts don't recommend this method, because the coaches who will pester you to apply for a card are usually very powerful, you may be at a loss.
My suggestion is, whether to buy a class or not depends on your own initial intention. Don't buy just because others have been pestering you and then feel embarrassed. In the end, it's useless to yourself. Our money only buys what we like, only what is useful to us, and does not pay for embarrassment.