Never, in my experience, because the said activists tend to accuse anyone who disagrees with them of being a bigot.
This is objectively false. There is 100% undeniable proof of these types of employees being there, including one of the heads of data analytics:
From https://janeyang.org/resisting/
> Racist capitalism is poison that has weakened every facet of society and been used to “justify” horrific crimes against humanity while destroying our planet. We need massive power and wealth distribution enshrined in national and international policies.
From https://janeyang.org/2021/04/13/im-getting-some-feedback/
> Guess who tends to beta spray? Men. White men, in particular.
From https://janeyang.org/2021/03/18/live-forward/
> If you are white or a man, especially a cis-gendered heterosexual able-bodied white man, do the fucking work. Learn about the characteristics of white supremacy, push through your discomfort, and reflect on how you show up in the spaces you have power. Be ready to apologize when you screw up (we all do!) and then do better. And whatever you do: do not demand that your friends or colleagues or employees or neighbors or acquaintances who belong to historically marginalized groups explain to you all the ways you perpetuate harm and how society got here. Pay an anti-oppression professional for training and coaching; don’t expect us to get you up to speed for free.
> every discussion remotely related to politics, advocacy, or society at large quickly spins away from pleasant. You shouldn't have to wonder if staying out of it means you're complicit, or wading into it means you're a target. These are difficult enough waters to navigate in life, but significantly more so at work. It's become too much. It's a major distraction.
https://world.hey.com/jason/changes-at-basecamp-7f32afc5
There's absolutely no reason to believe that there were any "ultra-sensitive trigger-warning micro-aggression seeking activists" at Basecamp among the employees. All we have is a blog post from someone who is overly sensitive to reasonable professional conversations and didn't want to deal with "unpleasant" conversations at work. It's a story told from that person's perspective and we shouldn't take it as absolute truth.