Bitchy work colleagues

[Whoknewitwasthishard]

I job share with a colleague much younger than me and not as experienced. They constantly criticise , bitch and complain about me to other colleagues. I have tried really hard to ignore untill I finally have complained to my boss and we had a meeting where job share colleague denied and laughed it off and now atmosphere is even worse.
What do I do to make this stop

Honestly, I’d probably leave. I couldn’t work with people like that. If leaving isn’t realistic, then be completely straight with everyone. Each and every time they bitch about people, call it out. Explain calmly that you don’t think it’s okay to do that at work. Eventually they’ll stop.