You said it yourself: for suggesting that he had an alt account. That could get you a ban on dbzer0 as well, in that case for “bad-jacketing”:

https://wiki.dbzer0.com/divisions-by-zero/the-golden-rules/

2. Don’t be shitty. i.e. telling people to kill themselves, or bad-jacketing is bannable.

You got a one day ban for direct personal attacks. Once again: people complaining about .ml "censoring" them are always just people mad that the rules got enforced on them when they're used to the mods giving them a parse for having the same politics