Was sick and coworker made nasty comment implying i was faking it

You dont have to read the whole thing if you don't want to, i just needed to ask an opinion.

I was INCREDIBLY sick and my co-worker made a horribly nasty comment to me implying I was faking it. I said I wasn't and she just walked away.

I then went over to my other co-worker not caring about her hearing and told my other co-worker how she just treated me. They told me i was justified for feeling attacked and how it was disrespectful of her. Then my rude coworker passed me with a brutish look on her face and avoided me at every cost through out the day.

I feel slight guilt from talking about her but I didn't say anything more than how she was rude, unprofessional and accusatory. I then heard her talk to another co-worker about me.

Is it normal to feel guilt over this?

Basically I came in 10 minutes late to work BUT I told all my co-workers I would be late. I was out sick yesterday and tried my best to come in today despite me being in absolute torturous agony because we're short-staffed. My co-workers in my department knew I'd be late so there was zero need to call in.

This woman who confronted me like a nutcase works in the department next to me and rarely even acknowledges me. I had no problem with her just always found her a bit simple-minded as she lacks common sense and basic knowledge. Unfortunately I can't fully avoid her at work as our work sometimes blends together.