At the risk of getting flamed - it’s often the less educated and disadvantaged who fall into the Indy camp
Poverty and ‘it’s them vs us’ plays a huge part in the tribalism in Glasgow and the west imo.
The split of areas into Catholic and not began when Glaswegians competing for jobs with the Irish immigrants clashed with them, hence the immigrants opting to live in areas with other immigrants.
Doing genealogy you see some things on certificates and in record books. Researching one family legend about a well off female relative who married an Irishman I found her marriage certificate and it actually has “Mick travelling salesman” as his occupation.
And although sectarianism has got lesser over the years children are still taught that they are different from each other the second they go to school.
Theres a lovely joint campus school in Lanarkshire (there are several I think but in the one I know of) it’s one big building, lots of talk about nice it is for the children to go to the same school building. They have breaks at different times, they have lunch at different times and use different entrances. So they go to the same building but they don’t mix.
When the one in Cumbernauld was being built the Catholic Church objected to the children potentially using the same entrances. They also wanted separate staff rooms. No dilution of the religious ethos should be allowed… It’s absolute nonsense that they should have had any say in what door children go through.