I think the problem with the idea that those particular posters are GR fans becomes clear if you compare their posts with fans of Bottas when he was at Mercedes. Very few (if any) of those posts were along the lines of. "I'm a long time Hamilton fan but he's literally the worst driver in the sport and should be put out to pasture before he embarrasses himself any more. He's pathetic, only ever won a grand prix because the rest of the grid let him win and he's also the worst. Oh, and I guess Bottas exists or something."
As an aside, comparing the pace of both Mercedes cars on the Hards is an interesting errand. I'm just guessing, but perhaps one of them had to overtake some cars? But it's interesting that 'George fans' apparently expect their driver to be slower in clean air than the washed up pensioner is in dirty. Otherwise, it wouldn't be worthy of comment.