yeah i think this is partly true, i think it also has some to do with your connection as well.
if i tune down my connection and get into a match, i seem to play with alot more Hispanics, but if i free up my bandwidth, i get normally a good mix of people
Having dumped my ps4 I have been playing now on the xbox one with a smaller player base. The latency is much lower on the xbone, it's not perfect but it's head and shoulders connection wise over the ps4. On the Playstation I will get days where it's really bad but on the xbox it's just the odd game. I swear the psn hates my fibre connection.