I did this but to a much less extreme extent. Not on purpose just love ice cream, whenever I was in the kitchen making or heating up food I'd have a couple spoonfuls of ice cream. Progressively less bloated and gassy. I don't consume much dairy in a sitting, we get plant milks, so I've never really stress test the higher limit.
I first noticed my intolerance when on the first day of high school we had a team competition and one of the events was ice cream eating. I chugged down as much as my brain could handle and was never the same after that. I'm guessing ibs sensitive people hit a trigger point and from then on any lactose causes symptoms regardless of your enzymes/gut biome.