Depends what you mean by common. People who eat with their mouth open, screech with laughter, don’t look you in the eye when they talk, are incapable of holding a civilised conversation and are just generally loud and coarse and ignorant, with filthy manners and zero charm or refinement, revolt me.
But swearing, painting your fingernails green, getting a fake tan, etc doesn’t make you common. And neither does living in social housing. I have chatted to Big Issue sellers who had more class than a horrible oaf like Prince Andrew. The ridiculous little class signifiers (whether you say ‘settee’ or ‘sofa’, ‘dinner’ or ‘tea’, etc) also mean nothing to me.
Like it or not, classy people are sexy and attractive. Common people (by which I mean ignorant, crude, oafish, coarse, ill-mannered, etc) are a turn off. But being common has nothing to do with money or having fun. You can live in a council bedsit, wear bright clothes and get pissed in the local pub every night and yet still have class. Equally, you can live in a detached house, hold candlelit dinner parties and speak with a fake upper class accent but be hideously common. It all comes down to manners and charm.