This seems to be a repeating issue at work for you, as this sort of behavior has been brought up in the past. If there’s difficulty understanding why your jokes are inappropriate compared to others (which may or may not also be inappropriate), then don’t risk it. Just don’t joke around at work. Period. Don’t try to compare your actions to coworkers’ actions. It hasn’t helped in the past. I know it doesn’t feel fair. I know it feels like a double standard. It’s okay to feel frustrated by that. But this has been a repetitive, long term issue so just stop joking altogether, whether you understand why or not, or you could lose your job.