I was getting tired of this guy asking me about really simple things, so when he asked me how to change the email signature I taught him how to google it. He unironically thanked me.

I can appreciate that he thanked you. I always feel like Googling is the obvious thing, and telling them to Google might insult them. But that's not the case for everyone of course ^^

Next time he asks something, just make use of this: https://lmgtfy.com/

If I were you I'd just give him a link to the site https://newoldstamp.com/solutions/..., where I ordered email signatures for my employees. They are very unique and beautiful, which is necessary for official communication with clients and partners. I advise everyone to pay attention!