I notice what I say a lot more. At pawn shop, and talking about cutting cable, and mentioned I had fiber, and she said her friend worked for company who installed mine, and I just automatically assumed it was a man, and said something like "oh he does, neat". Of course if a woman, she didn't care to make it a big deal, but is wrong to assume only a man can work at fiber company, or stupid I didn't assume a girl's friend is a girl.
When online, its worst. People will talk about someone, like getting a new job at a game company, an auto-assumed it was a man. A ton of these scenarios happen, like when talking about anonymous people, all I can do is Spanish rules, where I go masculine.
I try to use different words like "dude". But if you're a girl, would you rather everyone just call you he, or another term like bro or should I avoid pro-nouns and use peoples names, even if multiple times in a sentence.