Canadians are famous for being polite, but as most outsiders learn quickly when interacting with Canadians, they sometimes use this politeness to say something incredibly indirect, ironic, or passive-aggressive things.
Dismissive neutrality

“That’s interesting.”
Uttered neutrally, Canadians will use this phrase to actually communicate that they completely disagree with you or don’t understand you at all. It’s like a nod and smile to the person talking in order to abruptly end the conversation before it veers into awkward territory. You’re essentially saying, “Thanks for speaking, but I didn’t really just like your idea.”
Social warning

“You’re very bold.”
Boldness in Canada isn’t often used as a compliment. Instead, one might hear this compliment if he/she is being rude or wearing something outrageous.
It’s meant as a warning that you’ve done something socially inappropriate, or that you’ve likely broken some kind of unwritten social rule. But nobody wants to ruin your day by pointing it out.
Subtle critique

“That is very unique.”
When Canadians tell you something is really unique, what they really mean is that they can’t think of anything nice to say about something (project, outfit, idea, etc.).
It’s their way of being truthful without actually lying. This is perfect when you don’t want to tell someone you’re straight-up lying.
Gentle correction

“You’re so passionate.”
If you find yourself in an argument with a Canadian who thinks you’re being too loud or too aggressive, don’t be offended if they simply call you passionate.
Rather than telling you to simmer down (which would be rude), they’re basically letting you know you’re too much for the people around you.
Cleaned up

“You clean up nice.”
It’s a common wedding, party, or formal line that people hear when they’ve legitimately put effort into their outfit or look. It sounds nice until you realize it’s basically saying you usually look terrible.
This comment questions how you normally look, implying your standards are messy, basic, and/or boring. Some Canadians love throwing shade disguised as a compliment so it can often be said with a chuckle or smile.
Selective praise

“You’re pretty cool for someone your age.”
This is a backhanded compliment that simultaneously compliments you and insults literally everyone in the same age range as you.
Canadians love to say this to random older adults, teenagers, or younger coworkers they realize they click with. It implies they had expectations about a person because of their age, and that person managed to defy them.
Helpful doubt

“You’re so adventurous.”
Whenever someone from Canada tells you that you’re adventurous, that’s usually not a compliment. They’re quietly judging you for not exercising a basic minimum of caution/common sense.
It is the polite way of saying that you have chosen a path full of unnecessary difficulty or risk, and that they would never choose it for themselves.
Soft rejection

“You certainly tried.”
Despite its encouraging tone, when someone says “you tried” in a professional or creative setting, what they really mean is your attempt was a complete failure.
It both compliments the work by noting an effort was made, and totally dismisses its lack of quality or success. It’s a nice way to tell someone they didn’t meet expectations.
Empty approval

“Good for you.”
The tone in which someone says this literally determines whether or not they’re actually being nice. Said with pride and excitement, it sounds encouraging, but said with no inflection, it sounds like the verbal equivalent of a shoulder shrug.
Canadians will say this when they want to congratulate someone without actually sounding like they care. It doesn’t encourage or celebrate your achievements; it merely communicates, “It’d be socially remiss if I didn’t say something.”
Organized chaos

“You must be so busy.”
On the surface, this sounds sympathetic and understanding. It’s usually said when someone’s house is super messy, their office is overflowing with paper, or they’re just really disorganized.
Canadians aren’t the type to be upfront with criticism, so this’s a nice way of saying “everything here looks like it’s falling apart”. What it’s politely implying is that you don’t clean because you’re lazy; you clean because you have no time.
Sources: Please see here for a complete listing of all sources that were consulted in the preparation of this article.