I have worked in my current company for 1 year.
There are afternoon work events planned a few nights a week. Many are reoccurring. Game night one evening. Quiz night another evening. The company loves Christmas parties and dinners.
I have worked in a few companies over the years and I have always maintained that work is work. I do my hours and leave at the end of the day. I don't attend Christmas dinners or quiz nights just because I socialise with friends outside of work and no matter what these events always feel like working and maintaining appearances.
My manager asked me on Friday whether everything was ok as it had been noted that I hadn't attended any of the after work activities and I had politely rejected invitations for all the Christmas parties. I explained that I never have and never intend to go to any. Maybe some people would see it as a shame but, I go to work to do just that and my day ends at 5pm.
I have such a good relationship with the people I work with and he agreed with this completely but, he said some people have commented that they think that I feel superior to them 
Do other people feel like this when a member of their team doesn't go to any afterwork events or Christmas Dinners etc? Is it unreasonable not to attend any of these events?