Urine isn't sterile, though[1], and there's good reason to believe that the toilet seat is one of the least concerns when it comes to sources for bacteria[2].
I can buy the argument for "I prefer not to sit", but I'm not convinced about the hygienic aspects.
[1]: https://www.popsci.com/urine-sterile-drinking-pee/ [2]: https://time.com/4908654/cell-phone-bacteria/