Is my coworker ignoring my messages a red flag or just normal behavior?

I work with a guy named Steve. We are not friends but I would say the relationship falls into the "work friends" category. We get along and have good banter back and forth. We work in other buildings but cross paths from time to time when we need to.

The other day I asked Steve a question through text about work. I asked him if his work load was getting light because mine was and I wanted to see if that was just me or across the company.

He completely ignored my text for three days. Then. He needed a question answered about an assignment so he asked me but he never responded to my question or had an explanation why he never answered.

Is this a red flag? I'm left wondering how to feel in situations like this because it feels minor and not a huge deal, but it also feels like he's not respectful to my point of view and only was reaching out because HE needed something.

I'm always left wondering if I should let it go because it's minor or if I should just write him off in my mind as someone i can't trust. Situations like this always seem to arrive so maybe people in general are just unintentionally disrespectful?

Red flag
Let it go like it didn't happen.
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Is my coworker ignoring my messages a red flag or just normal behavior?
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