In a similar vein, I hate it when people post a photo of their other half on social media and refer to them as "this one".I can’t stand it!! Or when (using your username as example) they have kids and say littlest islawight/baby islawight instead of my youngest son. Oh my Christ, it makes my toes curl, but most posters seem to do it so we must be in the minority!
For example: "Celebrating three years with this one", or "enjoying a fab meal out with this one".
I don't know why, it just makes me cringe.