My colleague has a bad habit of complaining about the manager and team members to me. I don't say anything as I look at my screen and do my work when he is talking. This colleague has a grievance against the manager and the manager has made a counter allegation.
I find my job stressful as there is a lot of work involved and I have been covering work from a long term vacant post which was only recently filled. Today I forgot he was in the office and he was moaning. I don't want to get involved in office politics and hearing about the same incidents is getting me down. I can arrange my calendar to go in on the days he is not in. Anyone got any other tips? Negative people like him make the job worse.