Back on topic, you raise an interesting scenario, Mlle.
It calls a few things into question, but I think there is an over-arching issue, and I see it everywhere.
No one will be terribly surprised at this, of course. Essentially, it's trying to foist one's own beliefs or feelings onto others.
Why should you, or your husband, care what a random person on the internet thinks about your situation?
But it's so prevalent. People trying to tell others what they should do or how to behave. People making comments or statements that the parties involved could care less about.
As it happens, I am one of those people who sleep through whatever, and I never mind being awakened by my love. She can wake me any time, for anything. When she can't sleep, I read to her and it helps. I fall right back to sleep after she does.
People seem to want to tell others what to do, that's common.
I think there is another underlying thread, and that's the propensity to try to defend those who want no defending. He most likely felt that he was somehow 'helping' your husband. Maybe the poor sod just couldn't bring himself to let you know that, gosh, that lamp is so annoying. In rides the internet cowboy to save the day and champion the downtrodden husband!
Of course, there is the golden rule of human interaction. He most likely has many, many other issues that one could wax rhapsodic about for pages (mommy issues, daddy issues, the need to subjugate others, the need to make oneself feel superior... on and on..)
But your main point is valid, here or anywhere. People need to smooth themselves out a bit and not enter 'internet free-for-all' mode at every opportunity.
TL;DR: The internet is full of assholes. Let's all try not to be one.