Again, people confuse consideration with crime.
You CAN do it, and although it is not directly comparable to some of the transgressions mentioned, it is still inconsiderate.
People seem to want black and white on this, but it is just grey.
Microwaved fish reeks. Period.
Making a LITERAL stink in the office, no matter where, is inconsiderate. The further that stink is from the local where it was contained/almost expected, the worse it is.
Poo stank in the bathroom is not APPRECIATED, but accepted. In the elevator? No.
Fish smell in the cafeteria is more tenuous because although it IS a cafeteria, it is still an OPTIONAL thing to have fish as compared to taking a poo.
It is all on various balances depending on how avoidable it is, and how many are genuinely taken aback by it. If people do not like it, and you can easily avoid doing it, not doing so is selfish and will be met with disdain and resentment. MANY things in life are like that, some more valid than others (such as wearing a bhurka.....).
But just face it. You were inconsiderate, you got your back up when somoene confronted you on it, you KNOW you were wrong, and you posted online to get support from complete strangers.
Go home.