Has got nothing to do with it in my opinion. Keepers get attention because of their individual performances and spectacular saves (especially if they win points by doing that). De Gea has made some freakishly, exceptional saves this season which have been highlighted by the media a lot (for example, the ones against Everton coming to mind). Most people don't watch an awful lot of football, let alone all games of Chelsea/Atletico and United. Their views will be affected and shaped by what the media tells them. Last year, that came in handy for Courtois with their title and CL final. This year, it works in favor of De Gea. I still rate Courtois higher though, but it's only normal a lot of you will disagree with me about that.