I’ve seen those before (also for maternity or for people who were taking extended leave). I really appreciate it, personally — it basically lets the sender know that the ball IS still in their court, which I don’t see as inherently offensive or attitudy.
Save www.indeed.com https://www.indeed.com/career-advice/career-development/holiday-out-of-office-messages · Holiday out of office replies are automated email messages that professionals use to let others know they cannot respond due to being on vacation during a holiday. These messages typically include: An apology for the inconvenience A reason for not replying right away

But your out-of-office message is as much for you as it is for the people receiving it, especially during the pandemic. “Boundaries have taken a big hit right now,” Ritter says. There’s a lot of pressure associated with missing something at work, and that stress has been heightened without the typical separation between office and home and with the added fear caused by an uncertain economy. An OOO message is a chance to set expectations, “to give yourself some breathing room and to ensure other people aren’t thinking negatively about you,” Ritter says, and it’s crucial for your mental health.
But this absence of basic travel cybersecurity is a problem. Email is the number one threat vector for socially engineered attacks. An automatic reply message not only sends the information to designated contacts, but it also bounces back to people who send phishing emails. Threat actors use any details found in OOO messages to craft targeted social engineering messages. Well-targeted messages build trust that threat actors take advantage of.