Earlier quoted context omitted.
Also if you sound dumb it's out there for the public to see.
It's the job of everyone on the team, especially leads, to reply in ways that make sure everyone knows asking a dumb question is significantly better than being blocked. I would prefer to answer dumb questions all day long than have people on my team grind to a halt for a day because they're scared of asking for help.
They're just doing it via DM instead of in the 'public' chat.
Slack is literally telling folks: 'You are holding it wrong'.
In reality their product isn't that great for q&a or knowledge sharing. Horrible search, bad notification, high noise to low signal.