Work colleague doesn't want to take part; has their reasons (has been totally shafted by work this year & finances are an issue) and is very much keeping themselves to themselves as a result, whilst still working well and meeting all targets. Is not a very sociable person regards work, keeps work/personal life separate.
Boss had a 'word' re not being a 'team' member and said although not obligatory, their lack of joining in is 'casting a pall' over working relationships.
It doesn't bother me if colleague participates or not, in fact I don't think many people would be bothered either way but is the boss wrong for putting pressure on colleague?
Posted elsewhere originally but think this may escalate unfortunately so posting for advice for colleague.