Something I've noticed as a dynamic between Rob and Josh is that Rob really enjoys and relishes having one over on Josh.
His instagram stories about Josh being late (which I get, would be annoying!), his constant jokes about Josh 'looking scruffy.
I'd find it quite hard to say to one of my good friends that my mum thinks they're scruffy?
And the thing is, I can't recall an instance of Josh ever doing it to Rob?
It reminded me of something I read at uni (I wrote a dissertation on class) about how working class people are often held to higher standards and so feel more under pressure to always be presentable, have impeccably clean homes etc. So, that could explain why Rob is doing it but my god I find it annoying to listen to. It always goes on about three minutes too long.