Calling someone an idiot or claiming there is a widespread learning disability that makes most people idiots is pretty ableist. If they're wrong, or they're jerks, that's probably the thing you should focus your commentary on.
Idiot is a slur that implies some degree of learning, intellectual, or developmental disability, and is often used to other non-disabled people by painting them as having such a disability. This cements the mental habit of treating such a disability as a form of inferiority, and of dismissing the views of those who are perceived as having such a disability. You are tearing down a whole group of marginalized people who are innocent bystanders when you use a word for them as an insult for others.
It's the slightly less offensive sibling of the r word. Please don't use it. Focus on behaviors, not abilities.
So, #writingCommunity and #writersOfMastodon, I got a chance to use #etm, the latin abbreviation for "et merda" (and shit). The best insults are those that go over the insulted head. I found something really irritating in Siri, more than usual irritating, that should be fixed, so I wrote a feedback:
The "Siri, Lights" command on Home Pod makes no sense as a toggle. If you have 5 lights in a room and 2 are on, if you say "Siri, Lights," it turns the 2 off and the other 3 on, etc., etm. Is there an actual use case for this? This doesn't feel very intuitive. It seems to me that this behavior would teach the majority of people in this situation not to use the "Siri, lights," commands the first time this fails like this.
The best insults are the ones that go over the insulted head, but not those of the audience. I expect to use this a lot! In fact, I'm printing it out for my wall.