The trouble with “creepy” is that it’s emotive. Although it’s absolutely a correct word to use, it can easily be dismissed as an insult.
“Weird” is less of an insult, and can be taken objectively. I’ve got OCD, I know I’m weird - I’d be lying if I pretended otherwise.
But the thing is, Trump and Co don’t just want to be seen as “normal”, they want to be seen as the best at “normal”.
This is why “weird” works. It’s possible to argue that Trump being creepy is just someone else’s opinion, but it’s very hard to deny that he doesn’t do and say some weird things.
This is sticking because, even with the ludicrous amounts of good-faith his supporters have for him, it’s undeniably true, and possibly taps into any underlying misgivings they may have.
Is it possible to just tell them it’s a medical appointment, but it’s about something that you don’t feel comfortable talking about?
It’s the truth, it explains the secrecy about the appointment, but it keeps the secret.