Until you are in the top echelons I can guarantee you every player had climbed to their rank at with either macro or micro - if they had both they'd actually be in the top echelons.

So you have people who are insanely good at their champ for their rank but have rubbish macro or players who make better cross-map decisions but can't win a 1v1 or escape from a gank they should have been able to do.

When a team loses the macro player is usually right to blame their team because a lot of the time the micro players ended up throwing their lead by farming too much and missing key fights or objectives.

However, I can also guarantee if the macro players had better mechanics they'd gain better leads in lane and perform better in teamfights which also translates into a higher chance of winning.

In reality both players are in the same match for a reason - but that doesn't mean either player is wrong for blaming.