It's difficult to gauge what level of criticism is appropriate. Yes, he's human and all referees are fallible; on the other hand, if some one is not good enough to grace the field of play at professional level (or any level for that matter), they're gonna get called out and that experience is never likely to be nice
That's life
To me, blame lies with everyone involved. In particular, the PGMOL and the selection process for SG1/SG2, both of which carry referees for many many years who are nowhere near up to standard. Since taking to the whistle, it's become apparent to me that there's something not right with Referee Development and Promotion. If we want to progress, we have to adhere to someone else's creed and there's virtually no scope for finding talent through 'natural selection'. Either strictly obey the cardboard cut-out code, otherwise forget about progressing
WRT Mason, he just doesn't look right on the FOP. His scuttling running style, age, body-language and overall ability falls a long way short of my expectation and that type of comment and criticism is just a fact of life for anyone under-preforming in the public-eye
But of course I have sympathy for him as a person with feelings and so on