It is just that here, in this situation, I didn’t get it

I scrolled back to see, and I think that initial one was just someone who disagreed with your suggestion, for whatever reason (like I downvote incorrect responses to order of operations questions. i.e. hearsay which contradicts what's actually in textbooks and taught), but then yeah, there was some piling on when you asked for an explanation, and I just write them off as "I don't want to see this" types. At first it bothered me, but in the end I just take out of it that I got more upvotes than downvotes, so just proceed with business as usual then. :-)

Remember the human, and all of that

Yeah, there's some keyboard-warriors who forget that. You learn to just ignore the downvoters unless, like in your situation, you'd like an explanation as to why your particular suggestion was downvoted by someone. e.g. maybe they know something that you don't. There was a whole side-discussion about Kagi like that (someone had seen something on a blog, and someone else pointed out the CEO's response to the blog, etc. - I didn't read the whole thing... but I didn't downvote it either ;-) ).