I think there are a few different aspects at work here.
1) True anti-intellectualism
2) True bigotry
3) A young, impatient man
4) A potentially biased man
To be fair, none of us know his FULL story, nor can we, but judging based solely off of what he is written, I see two gripes. First, that he was seeking the mysteries and deeper meaning and it was just a social club, and second, that while people claimed to open-minded, they truly were not.
Regarding him seeking deeper meaning...I call BS. He was initiated in January 2016, and by the time he demitted (and we don't know when that was, but it had to be prior to November 2018) he had received all 3 blue lodge degrees, 29 additional SR degrees, about half of the YR degrees, and had become a Shriner. That's like a man sprinting from one end of the library to the other and then complaining that he didn't learn anything from all the books he just ran past.
Now, that's not to say that there isn't an air of anti-intellectualism in some circles of Freemasonry, but if you won't slow down to actually digest what you've already been given, then I don't want to hear the complaints.
In terms of bigotry, the examples that he gave are regarding the posting of anti-immigration and anti-Islamic material on social media. I don't know exactly what the posts were, but particularly in terms of the immigration matter, it is possible to have different opinions on these political matters that are based on factors other than bigotry. Was he viewing differing opinions objectively, or just reacting defensively?
Again, that's not to say that there aren't bigots and outright racists in Masonry; I've seen it first hand. But I've also seen men declare things as unMasonic the second it differs from their own opinions regarding how a person should act.
In short, I feel the topics being brought up are legitimate, but the claims of this individual do cause me to scratch my head a bit.