The language snobbery thing isn't confined to speakers of Standard English. The dialect of Scots from West Central Scotland (ie Glasgow) may be the best known to people outside of scotland but it had a very low standing among the Scots purists themselves with many at one time not even recognising it as proper Scots at all. The Scottish National Dictionary, a work on the Scots language which was 70 years in the making, has in the preface

"owing to the influx of Irish and other foreign immigrants in the industrial area near Glasgow the dialect has become hopelessly corrupt"

It may be urban and less conservative than the other dialects, and it may be more anglicised than the rural dialects in their richer forms, but generally it is now regarded as being a form of Scots.