I 100% agree tha bettas can live happy/healthy lives in 1 gallon bowls/tanks After all, anything is better than their dirty cups!
Currently each of my bettas are in a 1 gal. Each of the one are heated and decorated beautifuly. Each of their homes 25% change every 3 days and a 100% weekly, so their water is always fairly clean. They all love and appreciate their home, so I could care less on anyones criticism.
It is WRONG that some people are insulted and offended because of their bettas homes. We all provide the best we can for our bettas and deserve respect because of that.
Think about it like this, remember the house you grew up in?, your parents picked it out. Maybe some of your friends had a bigger house then you,but that doesn't mean you didnt like your house. Your parents put you in your house because they thought it best for you, it was their judgement/decision. All of us fish keepers are like parents, we pick what we feel is best for our "children." And its entirely our choice to keep our fish as we see fit.
This is a great forum, so we need to get past all this drama and accept that some people have different opinions. Lets all remember that its important to respect everyone on here. I love this forum and I hope we can continue to maintain its friendly atmosphere :)