It's possible that the other characters in the comic strip had a stereotype about boys and flowers and so they laughed. Or perhaps the flowers were associated with something negative in their minds. Also, it could be just plain teasing without a specific reason.
Maybe because the flowers were considered odd or not in the usual style. Or it could be that the boy was laughed at for showing an unusual interest in flowers.
The boy might have been laughed at for the flowers because they were seen as too feminine for him. Or maybe the way he got the flowers or his reaction to them made others laugh. Sometimes in comic strips, the reasons for such actions can be quite random and just for the sake of creating a humorous situation.
Chapter 84 is the strongest chapter-level answer because it starts from When the villagers tasted his curry beef one by one, their faces revealed... and follows through on Why am I tasting sand in my mouth?" Wen Jiaojiao's bravado gradually....
A practical answer is Chapter 54, because it turns the idea into a concrete scene. The chapter opens with Five minutes later, the people of Chixia Village, who had received the..., adds pressure through Even the trolls in Jiang Li's live stream room were not very active..., and ends on She was.
Chapter 56 is the strongest chapter-level answer because it starts from Lei Shen originally had no idea about the trending topics on Weibo. and follows through on At this moment, Lu Xingchao was still in the dark..
Chapter 61 is the strongest chapter-level answer because it starts from Hahahaha, oh my god, Jiang Li's mouth is even more venomous. and follows through on A cold shower is pretty normal, right?.
If you want the clearest chapter reference, go to Chapter 75. Early on, The ordinary people in the livestream were all stirred up by this scene.; later, the chapter leans on [Did you see that, did you see that?.
If you want the clearest chapter reference, go to Chapter 77. Early on, Wen Jiaojiao's reminder calmed Shu Yan down.; later, the chapter leans on Indeed, the wild mushrooms on the Southwest Plateau were complex in....
The best chapter pointer here is Chapter 49, "Mysticism Girl Jiang Li". It opens with My phone!!!" Jiang Yan's roar echoed continuously through the mountains in... and closes on Thinking this, Jiang Yan marched forward, pulled Jiang Li down from her....
Chapter 54 is the strongest chapter-level answer because it starts from Five minutes later, the people of Chixia Village, who had received the... and follows through on She was also polite and friendly, and to top it off, she was good-looking,....
A practical answer is Chapter 54, because it turns the idea into a concrete scene. The chapter opens with Five minutes later, the people of Chixia Village, who had received the..., adds pressure through Even the trolls in Jiang Li's live stream room were not very active..., and ends on She was.
Look to Chapter 60 for the clearest answer. It begins with What's with Jiang Yan, treating his own sister Jiang Li like this?" "He..., keeps building through When Jiang Li found a place to live, she didn't bother with him either,..., and lands on And in traditional characters?" "What else?.