I also had no trouble reading the post, but it goes farther than this.
The human brain also looks for shapes of words. Since all captial letters leads to no shapes in words it's harder to read all caps. Check this out.
I CDNUOLT BLVEIEE TAHT I CLOUD AULACLTY UESDNATNRD WAHT I WAS RDANEIG. THE PHAONMNEAL PWEOR OF THE HMUAN MNID AOCCDRNIG TO A RSCHEEARCH AT CMABRIGDE UINERVTISTY IT DEOSN'T MTTAER IN WAHT OREDR THE LTTEERS IN A WROD ARE, THE OLNY IPRMOATNT TIHNG IS TAHT THE FRIST AND LSAT LTTEER BE IN THE RGHIT PCLAE. THE RSET CAN BE A TAOTL MSES AND YOU CAN SITLL RAED IT WOUTHIT A PORBELM. TIHS IS BCUSEAE THE HUAMN MNID DEOS NOT RAED ERVEY LTETER BY ISTLEF, BUT THE WROD AS A WLOHE. AMZANI HUH? YAEH AND I AWLYAS THGHOUT SLPELNIG WAS IPMORANTT!
You know that's harder to read. Not that you can't do it but it's harder.