Why is he like this

So in October my husband had a huge fit because my sister's boyfriend helped me with something twice, once while my husband was at work and once while my husband was with me, but a bit on the drunk side and not quite capable of understanding the situation properly.... He had a massive, massive, MASSIVE fight with me about it because I "entertained" it and I've sort of been tiptoeing around him about my sister's boyfriend since.

So today we had a Christmas <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> BBQ and my husband and sister's boyfriend was cooking the meat nicely together. At our house.

When the meat was ready my husband brought the meat inside and then for some reason, my sister's boyfriend decided to cut up the steaks. I mean to me it's not a big deal. We don't have enough steak knives for everyone to have cut themselves, it made sense.

But again my husband lost it. He said it's a matter of respect and "one man doesn't go into another man's house and cuts his meat". I mean my sister's boyfriend is also 10 years his junior and was raised in a different household. He said it's a matter of respect and who is he to come and take over a household and and and.

And I'm just like, why is he so angry about this. I mean my sister's made a salad - you don't see me getting angry that they made a salad in my house. My other sister even baked a bread! I'm not getting angry that they're coming into my house and doing this. I don't understand why my husband is so angry at my sister's boyfriend for this. I mean he doesn't even want to eat the food now.

I'm trying to understand but I just don't get it. It's not a big deal to me. Am I wrong because I don't see what the problem is?

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Gosh now that my family has left it's gotten even worse. Apparently I also slighted and disrespected him because I ate the food. I'm a bitch who doesn't get it. He obviously isn't man enough for me and doesn't provide well enough for me that I am eating someone else's meat in my husband's own home. That I had the opportunity to control it (which I really didn't - the meat was already cut when I walked into the kitchen). That I obviously see him as a cuck. Shouted at me that I just don't get it when I said I DO respect his position in the house, that's why I offered to make his plate before mine (which I do ALL THE TIME). Apparently he still holds the incident from October against me. That I must watch out what happens a third time. Etc. I can't.