I can’t speak for anyone else but I don’t really see any aggression or sarcastic remarks on this thread, simply hobbyists debating a hobby. Don’t take things too personally, no one here is an expert nor cares enough to get worked up over guppies. Take things in stride. That being said, many including myself with many years of experience, research and tens of thousands of dollars spent on a hobby, will indeed have a thoughtful discussion on a topic they find interesting and it makes everyone better because of it.
If you are interested in brackish water species I suggest reading any material written by Neale Monks. He is an extremely valuable source of aquaria information with a focus on brackish water species in particular. The Puffer Forum, also another great resource. Any literature by Ichythyologists are a valuable resource on a given species, as is FishBase. Any old school WetWebMedia is also a gem.
Good luck, keep growing and learning.