I've also noticed, particularly in Russian but also other languages, men will use the "low colloquial" forms when speaking casually, but not inherently in a degrading or mocking sense. I've mostly seen it used as a "it's just $thing, nothing special/don't make a big deal about it."
Also men will swear a LOT more than women, I don't entirely know the reason for this.
Ща, 'то моя работёнка. (Yeah, it's my job)
It doesn't mean he doesn't like it, but it carries an air of "it's just a job man, I gotta make money."
@wolfbro No, it's always like that
Also always pronounce contracitons. Sérðu instead of sér þú
One maybe contrary thing is men add "a" in a lot of places like "sema er þannig" instead of "sem er þannig"
@applejack interesting
When I spent time in Iceland with extended family, I noticed something that was pretty subtle but noticable.
Dudes tended to use slang contracted forms like erþakki vs er það ekki? (really?) and hvaretta? (What's this?) and generally just speak in a far more relaxed way.
I never really heard (many) girls talk this way, but this was a few years ago, so maybe that's changed