This feels like an emotionally satisfying retort to the hiring manager, but it is not a well-calibrated response to routine sales objection.https://twitter.com/stephentyrone/status/923289924316647426 …
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I am very well acquainted with arguments for why asking about side projects disadvantages groups of candidates. The manager clearly isn't.
So give them what they want rather than what they specifically asked for: insight into your enthusiasm / ability.
If you for some reason have to say "I don't do side projects" (and you probably don't) a positive way to frame that is:
"I feel like we all get finite mental bandwidth for professional work. I seek out opportunities, like this one, where I could use all of it"
"Here's some things I like about your company which suggest I would be maximally engaged and productive, not bored, from working here: ..."
Ask about previous work and gauge from the conversation; referring to as 'side' is just perpetuating the 'never not be working' anti-culture
I'll admit I missed the tweet where you mentioned this as a concern, so apologies for that.
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