Great Saiyaman I wrote:1. They get money from Mr. Satan and apparently have enough to feed Gohan, Goku, and Goten. Plus before that they had Gyu-mao's fortune.
2.How does saying "he's a brat" prove he's a brat?
3. The only time in the manga he shows off is to Goku after Vegeta dies, and Goten has the same cocky grin on his face.
4.Where is this shown? Every time it's both Goten and Trunks acting up. And really the only time they act up is as Gotenks, because of how much power he has.
1. Chichi says that the prize money has almost run out. That's why she lets Gohan to participate in the tournament. Trunks is loaded. This makes him less likeable.
2. He
is a brat. The definition of "brat" is "a troublesome child". Which he is. Goten is too. They both put themselves into danger. But Trunks has taken the initiative to mischief way to often. Thus he is brattier than Goten.
3. He is the one that wants to fight in the adult league, and also he showed off when he wanted to fight Goten with only one hand. So he is more of a show-off than Goten.
4. Goten more or less follows everything Trunks says. If Goten doesn't agree, Trunks always finds some stupid excuse for it to sound as a right thing to do and not wrong. Thus he acts up more than Goten does.
Summary: Trunks is a less likable character than Goten. That's why more people dislike him than Goten.