I think it's possible to view the tweet as general bemusement rather than an attack, though I obviously don't know exactly what is intended. The next tweet is "

I think it's possible to view the tweet as general bemusement rather than an attack, though I obviously don't know exactly what is intended. The next tweet is "I'm sure there's a perfectly rational explanation for why this happens, but it's logged in an issue on Github, which I cannot read". I mean, it is a bit amusing to get an HTTP error as a result of asking a local interpreter to perform addition. I'd say it's not unusual for modern languages, particularly those integrating package managers, to lazyily download libraries and/or check for updates on the first run of a REPL. But it is a bit odd or unexpected that elm's REPL requires a network connection for every launch and doesn't fall back to a cached copy of the core library packages from a previous run when the connection fails.