Passive aggressive behaviour, which sounds very unprofessional.
If his manager is enabling or ignoring this behaviour, I would wager there is some toxic culture in action here.
Having said that, you should have a manager that you can give and get feedack to and from. Be open to criticism but also note any behaviour you feel is unfair or unbalanced.
If it looks like noone cares to openly discuss this behaviour I would start looking for a new job.
If his manager is enabling or ignoring this behaviour, I would wager there is some toxic culture in action here.
Having said that, you should have a manager that you can give and get feedack to and from. Be open to criticism but also note any behaviour you feel is unfair or unbalanced.
If it looks like noone cares to openly discuss this behaviour I would start looking for a new job.