Solitary pursuits are in no way a bad thing. Some of the unhappiest people I know are those whose leisure pursuits are what might be described as “social”, and they spiral into boredom and depression when on their own for whatever reason.
A lot of people would benefit from having a solitary hobby or two, especially things which don’t cost hefty sums of money to pursue.
Personally, I see enough of people at work, and working shift work as many will know this means the default answer to anything is “no”, it can be difficult enough to make times match up even with the other half!
As regards those who prefer to be on their own, I’ve found this tends to be related to whether someone was brought up as an only child or with siblings. It seems to be the case that those used to having had siblings around them cope less well with being on their own, whilst many only children relish it. Whether this has a bearing on hobbies in later life I couldn’t say.
Personally I find it a far more enriching use of time to sit and read a book or watch a documentary than sit on a train chanting rubbish, thumping tables and slurping beer, but each to their own I guess.