You can make a distinction between gender when it comes to the phrases. To my male friends, yeah. Depending on the situation I can see myself saying both of those phrases. But to my female friends? They don’t mean the same thing.

“Calm your tits” is a maybe depending on the circumstances and how close we are, but never in an aggressive tone.

“Stop being such a bitch”, downright out. Never to those friends. So many better ways to phrase it depending on the circumstances.

And finally, all of these were to my friends, NOT A FUCKING COWORKER. You never say these things to coworkers. The whole goal of team management is promoting teamwork, these phrase foster nothing but animosity. I try to say anything even remotely close to those phrases and my ass will be out of a job before lunch (and for good reason).

In terms of legal, IANAL, but as far as I know you would have to present this to a jury or judge, and the bar that they’d have to pass in the US is “more likely than not”. In other words: “is it more likely than not that this comment was made to harass the individual based on their sex?” Pretty low bar to cross.

Also, LTT is a Canadian company, so the above paragraph is kinda moot to the whole situation.

TL;DR: those phrases are rude to women, LTT would likely have a rough time in court (if they were a US company)

If I said either of those things to any of the women I work with I'd likely get fired before the end of the week. And they really do not want to fire me

It has to do with how the parties involved interpret it. Between friends I have said the same things, but not everyone will be comfortable with these things said to them and can even interpret them maliciously. They can be seen as workplace harassment for this reason.