I feel like "I built" has a level of pompousness implied that I think is correlated with AI bros. I'd normally use a verb like "made". I know it's a synonym but it seems less tooting-your-own-horn in connotation. I don't think I've naturally said in a sentence that I "built" a tool.
Before I get strawmanned, no I don't think there's anything wrong with saying you built something. I'm mentioning that there's a minor difference in connotation that leads to one verb correlating with vibe-coding. That's all.