<human>: There are a couple coworkers I don't get along with. No big deal, I thought, I'll just work with them less, only communicate via email and make sure to CC my boss. Note: I only CC my boss because THEY have added him on emails where I was trying to work with them directly. Professionally. Unfortunately time and again they've show they can't be professional, not even competent so adding my boss to the CC ends up shooting themselves in the foot.

I work in the office. The others are telecommuters so I don't even have to say Hi in the morning. It has been a couple months without incident (so I thought) then today I get this IM:

"Problem Co-worker - Ugh...you know [My Name] is at home." 

I assume it was accidental. We were on a daily SCRUM call and one of the devs was asking about a task that I was responsible for. I had been replying but I was on mute (as I often do). After unmuting and answering their question I IM her back: "Yeah? Nice one _____." It's five minutes before she replies:

"hahaha...well everyone was asking where you were...and you wheren't on yet...sorry"

Except they weren't asking and she wasn't answering.

It's obvious that she was smack talking to the other coworker about me taking calls from home -- which actually is allowed. I could telecommute if I want. So her comment doesn't even make sense except for the fact that it's one of probably many other crap talking IMs she makes with another team members. This happened to be the only one I saw cuz she IMd it to ME (not really surprising as she's not competent in any other areas of her job).

What I want to know is: is this a hostile environment? I look up 'hostile working environment' and it all seems to be about sexual harassment.

Condense the text into a few key points
<bot>: Co-worker accidentally IMd gossipy stuff about me TO me and I want to know if I should take HR action.