is this BU?

[CandyCrushLoco]

A child goes to a club weekly and, whilst this is happening, the parents all sit in the adjacent cafe which is owned by the people who run the club.
One of the parents used to be fairly sociable and chatty but for the last few months has been very quiet and pretty much ignores everybody else and doesn't say hello unless somebody says hello to them.
Is it being unreasonable to ignore them or is it reasonable to ignore them because they are sending out what could be very clear 'leave me alone' signals?

[JessiePinkman]

It is very tough being sociable when you're going through a tough time. Some people will get that, others won't. I guess it's one of those times you find out who your real friends are.