Guy at work messages me “hai” is that flirting? Do guys talk to other guys like this?

Whenever he dm’s me he always uses hai, is it just because I’m a younger girl? I can’t imagine him using this to the other men he’s working with? There are other reasons why I think he has a crush on me too, like on video calls with him he talks about himself for a good 20 minutes and we just talk about random things, when I had to interview to get the job he was one of the guys interviewing me then after they hired me he said right away he just knew I was the one and all other candidates didn’t matter anymore and how thrilled he was when I got the job. And other small things he says. I know they’re little things but idk… thoughts?

Guy at work messages me “hai” is that flirting? Do guys talk to other guys like this?
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