@ganymede 'run for the hills' wasn't magee's phrasing. 'Maybe it's that to you, but it helps me' is the actual antithesis of a 'one true wayist' attitude. There's no implication or accusation of laziness or stupidity being aimed at Cobalt whatsoever. There's no suggestion that it's the only way to learn at all, or that she doesn't understand the game or the rules.
The whole attitude was dismissive and condescending from the jump. 'Oh, sigh, that is a pile of garbage.' It's certainly not constructive, but the untouchables are freely permitted that, I suppose.
Is it intimidating and off-putting to some? Yep. Is it helpful to some? Yep.
Only one person here is making a personal attack, and it's one there's no reasonable basis to make, because the newer poster here never makes the claim or implication that there's any 'one true way'.
The closest thing to it is noting that if someone is intimidated or put off by the chart, it may not be a game they will enjoy, because ultimately it gets a lot more complicated than that, and that's not an unreasonable observation. That's not insulting to anyone. That's not making any claim they're too dumb to understand or learn it. That's a basic awareness that some people just don't like games with complicated systems, and even if there are things one can dabble in in the game that are not very complex as a new player, let's not pretend the game isn't ultimately quite complex with many conditionals to be kept in mind. It's perfectly fine for someone to not enjoy a game like that, and mage is definitely a game like that.