That lesson took me embarrassingly long to learn, but it's a good one.
I haven't given much thought to pattern-matching a loophole as a strategy, but your observation is key: people are willing to make exceptions, you just have to figure out how to get them to make an exception for you.
How to do that? Virtue signal. Watch other people for ideas. You won't have to watch long, people love to virtue signal and do it all the time. Validate their VS to score some quick points, swallow the small amount of bile that it brings to the back of your throat, and then pick something politically adjacent but not so directly similar as to compete/threaten. Those constraints are pretty loose, they should leave you with a wide field of possibilities to choose from. Pick the least unpalatable and you're set.
Myths, for some reason, often have loopholes. Achilles is invincible, except for his heel. Samaritans are bad, except for some good ones. So sometimes you can position yourself as matching the loophole and get a pass. Sometimes this is humiliating, though, or funnels groups of people into acting out narrow stereotypes.