Well what does support from him look like to you?
You've posted on a forum aimed at mums really and put this in the relationship section. The section of the forum is not directed exclusively at people with eating disorders so it stands to reason that, yes, alot of us will not understand where you're coming from.
I am saying this with sincerity and kindness but people with mental health issues, disorders, etc. are often very self centred (not aiming to be dereogatory, it's what health care workers often say) with their issues and this is playing out here. You are getting very defensive about some of the comments saying we don't know what it's like because we don't have an ED, but that's absolutely true. We cannot comment from your standpoint, only our own.
You are upset with your DH because of his comment and contemplated not eating dinner to punish him. Can you not see how manipulative that is? You are wrapped up in your own problems and not thinking how things could be affecting him. He too experienced lockdown. He has been made redundant. Does he not have feelings? Maybe his comment in your opinion was unhelpful, but if you've mentioned you're unhappy about your weight but he sees you doing things that won't help, it's natural to make a comment.
My mother is obese (perhaps you are not in that category so not quite the same) but I can sincerely say that the few times I comment about her eating, it most certainly is not to have a dig. I just want her to stop and think about what she's doing as I feel helpless. She has multiple health issues related to her weight and has been in hospital with severe breathing issues a few times. She's only in her late 50s. It scares me. I want her to be around for at least another 20 years. My DC loves her. I don't want him to lose her prematurely.
So I sincerely ask, what does support look like to you?
I would also like to add, secretly being upset about it then not eating dinner won't help. If you truly feel you just had a few sweets and it won't do any harm, say that. Perhsps he begs to differ but I feel open dialogue is better than concealed resentment. Does he do the food shop? If so, tell him to stop buying sweets as it's a temptation for you. The kids don't need sweets, there are other healthier treats to be had rather than dead calories.