My favorite is when they're clearly caught out so they move on to trying to minimise the use and optionally passively aggressively turn it back on you.

"I was genuinely only using Claude to make my writing clearer/redraft/to organize my thoughts because I can't write as well as you can"

The new one for me this week was someone claiming they write exactly like Claude does.

https://news.ycombinator.com/item?id=49212416

There are enough grammatical oddities (e.g. "reads off", "my not-the-proudest") in the linked excerpt that I'm honestly inclined to believe them.