The "fragrant" experience was augmented by having an infant with a poopy diaper changed just a few seats away. There is a changing table in the restroom. Don't do that on in the passenger cabin on the seats.
Maybe not during the flight, but I would have said something to them out loud ( so everyone could hear)after the flight that they stunk. I was on a flight in Italy, a woman carrying a large suitcase took my bag out of the overhead bin and told me to put it under the seat. I protested it, but the flight attendant told me to put it under the seat as my bag was smaller. Not wanting to get kicked off the flight, I kept my silence. However, after the flight I chased her down to baggage claim and yelled at her with a lot of F bombs. She looked terrified. I think she thought I was going to punch her. The moral of the story is when people don’t push back, the inconsiderate will continue their behavior. If they know that there will be consequences such as public humiliation they will take a bath before their flight, or just not be inconsiderate of others.