I think the problem was telling others and expanding the operation.

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Thing is, he knew beforehand that there will be too little food for him, he even brought it up with the bride. It's not entirely his fault that the whole pizza operation grew so big, but it did end up looking like he was throwing an alternative party at his car, which could've been avoided if he just quietly ate a sandwich by himself.

Something cold (like a sandwich) you could make at home or buy on the way to the ceremony and eat discretely in your car. Ordering pizza requires a delivery person to come to the venue or be intercepted in the parking lot. IMO this groomsman should have either made/bought a packed lunch for himself or said to his friend, weeks before the wedding “hey, the wedding party will be there longer than most guests, why don’t I arrange for a platter of veggie sandwiches to be in the dressing room so you don’t have to worry about it?”

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You can eat a sandwich in private, whereas pizza smells like you ordered an entire restaurant and everyone knows you have pizza within minutes.

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Not because he refused to starve, but because he was talking about having his food delivered so it became a thing. Being a gentleman also means not rubbing other peoples mistakes (ie the couple not providing enough food) in their faces,

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No, being discrete. Bride was wrong about the catering. He was wrong about making a public event of having food delivered. So hence the ESH.

Why would you bring your own food to a wedding? Nobody does that unless it's a potluck

How was he supposed to know the portion sizes and meal itself weren't going to be enough? All he was told was that it would be vegetarian. That doesn't mean "only a small salad, 2 veggie sides, and a single piece of cake" - there are lots of ways to do a vegetarian banquet or feast and ensure people's hunger is sated and they walk away happy and full. You're assuming way too much here (like that vegetarian = not enough or not filling enough) and you seem to believe that he should have, as well, without any other information beyond the fact that the catering would be meatless. Fact of the matter is, this bride was cheap and didn't provide enough food. And based on her reaction, it seems like she just wanted to force her dietary choices on others without regard for THEIR dietary needs. I guess all the hypoglycemics and diabetics in attendance, who depend on regular meals, were just supposed to be SOL then?