This is true. If our response to poor players or bad matchups was to be encouraging and supportive (and to play to the best of our abilities despite potential disadvantages), we'd probably cancel out some of the negativity that drags this genre down.

A lot of us tend to get angry or distracted when players don't perform or behave the way we want them to - as a consequence we miss an opportunity to potentially get them to pull their finger out, or we screw up our own game.

At the very least, not focusing on the nationality or skill of your teammates enables you to remove yourself from unnecessarily spending energy worrying about losses or getting stressed out about a game that's supposed to be entertaining. Yes, I know it can suck, but our response often dictates how much it sucks.

Intentional trolls and disruptive players are a different matter. At least unskilled players may try to make a contribution, even if it backfires. That's where the disadvantages of solo queue without a team come into play - and one of the potential drawbacks to the upsides (variety) of this genre.