Irrelevant. If he found these bugs, even if he’s been a dick about it then he still found a bunch of vulnerabilities that Uber was exposed to. Pay the man, it’s a few thousand dollars as opposed to a major exploit!
No one looks good - he doesn't look good for how he behaved/communicationed, Uber doesn't look good for denying the payout on a valid report, and Hackerone doesn't look good for not enforcing a minimum payout on a valid report.