If you criticize the effects of cars on society, are you a hypocrite for driving? How about riding? If you critique capitalism and wish it would end, are you a hypocrite for buying?
That's always a low accusation to make primarily because it's ad hominem and completely irrelevant, but secondarily because it's an easy attack that requires a detailed defense.
If a person making billions from running tobacco companies doesn't smoke, prefers people he's around don't smoke, and thinks that it's a nasty habit, is he a hypocrite? What about if he makes money from a rise in sales of sugary candy but thinks people eat too much sugary candy? What if he makes money from selling housing but rents?
Maybe, there's also something to be said for being pragmatic. You may not like the way the world is right now, but you still have to live in it, you know?
Except that his first words in the post are "About seven months ago, I abruptly quit Twitter.", so that's just utter BS.
I may be biased because Alex Gaynor is a prominent member of the Django community and one of the pillars of what made it so elitist and hostile to contributions. But then again, I hate twitter too.
I can see why he would want to do that; I hate Facebook and only hold onto it for a few long distance family members, but realistically I could drop it and communicate with them via my wife's account. However, if I drop Facebook then I also drop the FB Pages associated with the websites I manage. While it's not a huge audience by any stretch, it's still important to me.
In another example, recently I stopped commenting on OS News threads altogether due to the recent political shenanigans (in short, the managing editor stopped posting operating system/tech news and focused solely on the gamergate saga). However, I do still check out the site from time to time, and ironically both the stories and the subsequent discussions have improved in the past week or so while he's been on vacation. Still, I'm soured from engaging with that community for a while yet, even though I have friends there.
So I can see him keeping his Twitter account and only using it to promote his blog, declining to engage in regular conversation. On the one hand, maybe it is a bit hypocritical, but on the other, he's using Twitter for exactly what he said it should be used for.
https://twitter.com/alex_gaynor/status/524683684180271106
But even if they were, there's a certain irony to decrying Twitter while syndicating yourself on it.