I also don't think the times when these things were being argued about the opinions presented by Glaston as 'stupid' actually were quite so bad.
Rafael was a better RB than Walker at that time; the discussion was whether he was better than Zabaleta or not, and that wasn't just on here.
Valancia is (this season) a better RB than Walker too, and at the time when Shaw was being heralded as a better LB than Rose it was at a time when it was a lot closer than it is now.
And Nani probably was a better player at the time than Bale too.
I think Glaston's problem is that he gets carried away, as he's doing now, and starts to hype clearly very talented players with lots of potential as if they were the finished article about a season or two early. Which often leads him to be right, in a sense, that the players he's talking about are good players, but wrong about whatever he was actually arguing about at the time.
Thats his real problem really. No one has any issue with the suggestion Alli is a good young player enjoying a very good start to his career with the potential to be even better, but - even though Glaston acts like thats all he's saying - the nitty gritty of it is that he actually goes on to talk about them (and Rose, Walker, Kane, Bale etc...) as if they've already achieved it.
Thats why he gets so much flack.